Hello
I am new to python but extensive users of MATLAB. I wish to run Python function from MATLAB command prompt, so that the derived output can be utilized in further processing in MATLAB. I am trying to run this function available in this link. I have installed numba and numpy via cmd. As given in different tutorials, I have added my python path to MATLAB, using pyenv command. Then, I tried to call the function using below script for desired values as below:
[Twb] = py.wetbulb_dj08_spedup.WetBulb(25.,100000.,0.015,0),[0]
However, I am getting the following error:
Python Error: IndexError: list index out of range
Kindly help me in this regard. Also, if I wish to run for the time series array, how to define them from the MATLAB console. Do I need to define these vectors using py.numpy.array(A), where A is my time series array? Kindly help.
I am using MATLAB2024b.Hello
I am new to python but extensive users of MATLAB. I wish to run Python function from MATLAB command prompt, so that the derived output can be utilized in further processing in MATLAB. I am trying to run this function available in this link. I have installed numba and numpy via cmd. As given in different tutorials, I have added my python path to MATLAB, using pyenv command. Then, I tried to call the function using below script for desired values as below:
[Twb] = py.wetbulb_dj08_spedup.WetBulb(25.,100000.,0.015,0),[0]
However, I am getting the following error:
Python Error: IndexError: list index out of range
Kindly help me in this regard. Also, if I wish to run for the time series array, how to define them from the MATLAB console. Do I need to define these vectors using py.numpy.array(A), where A is my time series array? Kindly help.
I am using MATLAB2024b. Hello
I am new to python but extensive users of MATLAB. I wish to run Python function from MATLAB command prompt, so that the derived output can be utilized in further processing in MATLAB. I am trying to run this function available in this link. I have installed numba and numpy via cmd. As given in different tutorials, I have added my python path to MATLAB, using pyenv command. Then, I tried to call the function using below script for desired values as below:
[Twb] = py.wetbulb_dj08_spedup.WetBulb(25.,100000.,0.015,0),[0]
However, I am getting the following error:
Python Error: IndexError: list index out of range
Kindly help me in this regard. Also, if I wish to run for the time series array, how to define them from the MATLAB console. Do I need to define these vectors using py.numpy.array(A), where A is my time series array? Kindly help.
I am using MATLAB2024b. matlab – python, arrays, function MATLAB Answers — New Questions

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I am using Matlab R2016b. I need to convert a Simulink model to single-precision. When I click Analysis–>Data Type Design –> Single Precision Converter, I got a blank window.
Then I tried to use command line:
>> report = DataTypeWorkflow.Single.convertToSingle("MyModel")
it instantly returns:
report =
Report with no properties.
Which I believe it didn’t do anything, but no error or warning was displayed either.
Any help will be appreciatedI am using Matlab R2016b. I need to convert a Simulink model to single-precision. When I click Analysis–>Data Type Design –> Single Precision Converter, I got a blank window.
Then I tried to use command line:
>> report = DataTypeWorkflow.Single.convertToSingle("MyModel")
it instantly returns:
report =
Report with no properties.
Which I believe it didn’t do anything, but no error or warning was displayed either.
Any help will be appreciated I am using Matlab R2016b. I need to convert a Simulink model to single-precision. When I click Analysis–>Data Type Design –> Single Precision Converter, I got a blank window.
Then I tried to use command line:
>> report = DataTypeWorkflow.Single.convertToSingle("MyModel")
it instantly returns:
report =
Report with no properties.
Which I believe it didn’t do anything, but no error or warning was displayed either.
Any help will be appreciated single precision converter r2016b MATLAB Answers — New Questions

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We are looking for the leanest way to generate prototype and thunk files for a library we distribute to Matlab users. In our CI/CD process, we use Docker containers for building our libraries and would like to include the generation of Matlab proto and thunk files in the CI/CD process. Is there a way to generate these files without a full installation of Matlab? Is there a perl script or some other mechanism supporting this process?We are looking for the leanest way to generate prototype and thunk files for a library we distribute to Matlab users. In our CI/CD process, we use Docker containers for building our libraries and would like to include the generation of Matlab proto and thunk files in the CI/CD process. Is there a way to generate these files without a full installation of Matlab? Is there a perl script or some other mechanism supporting this process? We are looking for the leanest way to generate prototype and thunk files for a library we distribute to Matlab users. In our CI/CD process, we use Docker containers for building our libraries and would like to include the generation of Matlab proto and thunk files in the CI/CD process. Is there a way to generate these files without a full installation of Matlab? Is there a perl script or some other mechanism supporting this process? thunk, proto, loadlibrary MATLAB Answers — New Questions

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I’m currently testing the importing of a FMU v3.0 (Co-Simulation) in Simulink, which is supported since R2023b. In the 3.0 specification, binary data is supported as a new data type. I have a simple test FMU with an binary output signal, which is recognized when importing the FMU aswell as the data type "FMUBinary".

The model runs without any array error and the Float64Output behaves like expected. But when I try to connect the signal with any other block, like, for example a MATLAB function to do some calculations with the data, I get the error message:
Error:The ‘SubSystem’ block cannot accept a signal of type FMUBinary. A signal of type FMUBinary is connected to ‘Input Port 1’ of block ‘DynamicArray/MATLAB Function’.

Does some know how to handle this FMUBinary data type? Thanks in advance!I’m currently testing the importing of a FMU v3.0 (Co-Simulation) in Simulink, which is supported since R2023b. In the 3.0 specification, binary data is supported as a new data type. I have a simple test FMU with an binary output signal, which is recognized when importing the FMU aswell as the data type "FMUBinary".

The model runs without any array error and the Float64Output behaves like expected. But when I try to connect the signal with any other block, like, for example a MATLAB function to do some calculations with the data, I get the error message:
Error:The ‘SubSystem’ block cannot accept a signal of type FMUBinary. A signal of type FMUBinary is connected to ‘Input Port 1’ of block ‘DynamicArray/MATLAB Function’.

Does some know how to handle this FMUBinary data type? Thanks in advance! I’m currently testing the importing of a FMU v3.0 (Co-Simulation) in Simulink, which is supported since R2023b. In the 3.0 specification, binary data is supported as a new data type. I have a simple test FMU with an binary output signal, which is recognized when importing the FMU aswell as the data type "FMUBinary".

The model runs without any array error and the Float64Output behaves like expected. But when I try to connect the signal with any other block, like, for example a MATLAB function to do some calculations with the data, I get the error message:
Error:The ‘SubSystem’ block cannot accept a signal of type FMUBinary. A signal of type FMUBinary is connected to ‘Input Port 1’ of block ‘DynamicArray/MATLAB Function’.

Does some know how to handle this FMUBinary data type? Thanks in advance! fmi, fmi 3.0, binary data, simulink, fmu import, r2023b MATLAB Answers — New Questions

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Hi, I spent MANY hours to get my GUI running in 2025a – I included many changes to fix all the scaling issues of ui elements. I was always using the latest prerelease to implement and test these changes. Now after the "big mathworks crash", I finally could download the official 2025a release. And I notice that the scaling of ui element has completely changed and everything is messed up again. This is driving me crazy! Why are there prereleases if things are again changed in the last second?
I hope this is just a dpi scaling thing that can be fixed easily. Anyone maybe with some hints where to search?

Thanks!Hi, I spent MANY hours to get my GUI running in 2025a – I included many changes to fix all the scaling issues of ui elements. I was always using the latest prerelease to implement and test these changes. Now after the "big mathworks crash", I finally could download the official 2025a release. And I notice that the scaling of ui element has completely changed and everything is messed up again. This is driving me crazy! Why are there prereleases if things are again changed in the last second?
I hope this is just a dpi scaling thing that can be fixed easily. Anyone maybe with some hints where to search?

Thanks! Hi, I spent MANY hours to get my GUI running in 2025a – I included many changes to fix all the scaling issues of ui elements. I was always using the latest prerelease to implement and test these changes. Now after the "big mathworks crash", I finally could download the official 2025a release. And I notice that the scaling of ui element has completely changed and everything is messed up again. This is driving me crazy! Why are there prereleases if things are again changed in the last second?
I hope this is just a dpi scaling thing that can be fixed easily. Anyone maybe with some hints where to search?

Thanks! matlab, gui, pivlab MATLAB Answers — New Questions

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Hi, I’m trying to simplify my code. Right now I have my code set up like this:
Percentageoftimein_mp = sum(in_mp)/(length(in_mp))
Percentageoftimein_mb = sum(in_mb)/(length(in_mb))
Percentageoftimein_mp = sum(in_mp)/(length(in_mp))
Percentageoftimein_mcup = sum(in_mcup)/(length(in_mcup))
Percentageoftimein_mclow = sum(in_mclow)/(length(in_mclow))
Percentageoftimein_bof = sum(in_bof)/(length(in_bof))
Percentageoftimein_mc = PercentageoftimeinMClow+PercentageoftimeinMCup ;
I feel like I should be able to simplify this into a loop then adding my last line after the loop like this:
names ={‘in_cob’,’in_mb’,’in_mp’,’in_mcup’,’in_mclow’,’in_bof’}
for 1:length(names)
Percentageoftime+names = sum(names)/(length(names))
end
Percentageoftimein_mc = PercentageoftimeinMClow+PercentageoftimeinMCup ;
But I keep getting this error when I try:
% File: plot_smolts.m Line: 91 Column: 9
% Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other
% syntax error. To construct matrices, use brackets instead of parentheses.
Not sure how I should go about doing this.Hi, I’m trying to simplify my code. Right now I have my code set up like this:
Percentageoftimein_mp = sum(in_mp)/(length(in_mp))
Percentageoftimein_mb = sum(in_mb)/(length(in_mb))
Percentageoftimein_mp = sum(in_mp)/(length(in_mp))
Percentageoftimein_mcup = sum(in_mcup)/(length(in_mcup))
Percentageoftimein_mclow = sum(in_mclow)/(length(in_mclow))
Percentageoftimein_bof = sum(in_bof)/(length(in_bof))
Percentageoftimein_mc = PercentageoftimeinMClow+PercentageoftimeinMCup ;
I feel like I should be able to simplify this into a loop then adding my last line after the loop like this:
names ={‘in_cob’,’in_mb’,’in_mp’,’in_mcup’,’in_mclow’,’in_bof’}
for 1:length(names)
Percentageoftime+names = sum(names)/(length(names))
end
Percentageoftimein_mc = PercentageoftimeinMClow+PercentageoftimeinMCup ;
But I keep getting this error when I try:
% File: plot_smolts.m Line: 91 Column: 9
% Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other
% syntax error. To construct matrices, use brackets instead of parentheses.
Not sure how I should go about doing this. Hi, I’m trying to simplify my code. Right now I have my code set up like this:
Percentageoftimein_mp = sum(in_mp)/(length(in_mp))
Percentageoftimein_mb = sum(in_mb)/(length(in_mb))
Percentageoftimein_mp = sum(in_mp)/(length(in_mp))
Percentageoftimein_mcup = sum(in_mcup)/(length(in_mcup))
Percentageoftimein_mclow = sum(in_mclow)/(length(in_mclow))
Percentageoftimein_bof = sum(in_bof)/(length(in_bof))
Percentageoftimein_mc = PercentageoftimeinMClow+PercentageoftimeinMCup ;
I feel like I should be able to simplify this into a loop then adding my last line after the loop like this:
names ={‘in_cob’,’in_mb’,’in_mp’,’in_mcup’,’in_mclow’,’in_bof’}
for 1:length(names)
Percentageoftime+names = sum(names)/(length(names))
end
Percentageoftimein_mc = PercentageoftimeinMClow+PercentageoftimeinMCup ;
But I keep getting this error when I try:
% File: plot_smolts.m Line: 91 Column: 9
% Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other
% syntax error. To construct matrices, use brackets instead of parentheses.
Not sure how I should go about doing this. strings, for loop MATLAB Answers — New Questions

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Hi, I am trying to model a pressure regulator in simspace, but I could not manage to connect mechanical system to fluid system. I used single acting actuator and connect it to matlab function that has a function form all the "to workspace" blocks how can I fix the system I attached the picture of the systems.

% Compute spring force (negative due to opposing motion)
F_spring = -x * (k1 + k2) + F_preload;

% Compute pressure forces
F_pressure = P_out * A_outlet + P_atm * A_atm – P_sen * A_sen – P_in * A_inlet;

% Compute friction force
F_piston = mu * A_pis * P_sen;
F_poppet = mu * A_pop * P_in;
F_friction = sign(v) * (F_piston + F_poppet);

% Net force (sum of spring, pressure, and friction forces)
F_net = F_spring + F_pressure – F_friction;

% Note: m_tot * x_ddot = F_net should be solved externally (e.g., in Simulink)
endHi, I am trying to model a pressure regulator in simspace, but I could not manage to connect mechanical system to fluid system. I used single acting actuator and connect it to matlab function that has a function form all the "to workspace" blocks how can I fix the system I attached the picture of the systems.

% Compute spring force (negative due to opposing motion)
F_spring = -x * (k1 + k2) + F_preload;

% Compute pressure forces
F_pressure = P_out * A_outlet + P_atm * A_atm – P_sen * A_sen – P_in * A_inlet;

% Compute friction force
F_piston = mu * A_pis * P_sen;
F_poppet = mu * A_pop * P_in;
F_friction = sign(v) * (F_piston + F_poppet);

% Net force (sum of spring, pressure, and friction forces)
F_net = F_spring + F_pressure – F_friction;

% Note: m_tot * x_ddot = F_net should be solved externally (e.g., in Simulink)
end Hi, I am trying to model a pressure regulator in simspace, but I could not manage to connect mechanical system to fluid system. I used single acting actuator and connect it to matlab function that has a function form all the "to workspace" blocks how can I fix the system I attached the picture of the systems.

% Compute spring force (negative due to opposing motion)
F_spring = -x * (k1 + k2) + F_preload;

% Compute pressure forces
F_pressure = P_out * A_outlet + P_atm * A_atm – P_sen * A_sen – P_in * A_inlet;

% Compute friction force
F_piston = mu * A_pis * P_sen;
F_poppet = mu * A_pop * P_in;
F_friction = sign(v) * (F_piston + F_poppet);

% Net force (sum of spring, pressure, and friction forces)
F_net = F_spring + F_pressure – F_friction;

% Note: m_tot * x_ddot = F_net should be solved externally (e.g., in Simulink)
end simulink, simscape MATLAB Answers — New Questions

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Hello MathWorks team,
I have a Simulink model named experiment_demo.slx that includes a MATLAB Function block with the following code:
function adjusted_setpoint = fcn(setpoint, cfg)
adjusted_setpoint = setpoint * cfg.gain * cfg.offset;
setpoint is provided via an Inport.
cfg is a tunable parameter defined as a Simulink.Parameter with a Bus type (ModelConfigBus) and configured via the Model Explorer.
Model configuration:
Solver: Fixed-step
Code Generation:
System target file: ert.tlc
Code interface packaging: Reusable function
Code is generated using Embedded Coder. In the generated code:
The ModelConfigBus struct is defined in experiment_demo_types.h as:
typedef struct {
real_T gain;
real_T offset;
} ModelConfigBus;
My goal is to pass the cfg parameter directly into the generated experiment_demo_step() function, so that it can be configured from an external source (e.g., another module or application). Ideally, I would like the struct to be declared in experiment_demo.h and used as an input argument in experiment_demo.c.
Questions:
What is the recommended way to expose a tunable struct parameter like cfg as an input to the step() function in the generated code?
Is there a configuration or customization (e.g., via code interface settings or TLC customization) that allows this struct to be passed explicitly to the step function?
Would moving the struct definition from experiment_demo_types.h to experiment_demo.h be supported or recommended for this use case?
Thank you!Hello MathWorks team,
I have a Simulink model named experiment_demo.slx that includes a MATLAB Function block with the following code:
function adjusted_setpoint = fcn(setpoint, cfg)
adjusted_setpoint = setpoint * cfg.gain * cfg.offset;
setpoint is provided via an Inport.
cfg is a tunable parameter defined as a Simulink.Parameter with a Bus type (ModelConfigBus) and configured via the Model Explorer.
Model configuration:
Solver: Fixed-step
Code Generation:
System target file: ert.tlc
Code interface packaging: Reusable function
Code is generated using Embedded Coder. In the generated code:
The ModelConfigBus struct is defined in experiment_demo_types.h as:
typedef struct {
real_T gain;
real_T offset;
} ModelConfigBus;
My goal is to pass the cfg parameter directly into the generated experiment_demo_step() function, so that it can be configured from an external source (e.g., another module or application). Ideally, I would like the struct to be declared in experiment_demo.h and used as an input argument in experiment_demo.c.
Questions:
What is the recommended way to expose a tunable struct parameter like cfg as an input to the step() function in the generated code?
Is there a configuration or customization (e.g., via code interface settings or TLC customization) that allows this struct to be passed explicitly to the step function?
Would moving the struct definition from experiment_demo_types.h to experiment_demo.h be supported or recommended for this use case?
Thank you! Hello MathWorks team,
I have a Simulink model named experiment_demo.slx that includes a MATLAB Function block with the following code:
function adjusted_setpoint = fcn(setpoint, cfg)
adjusted_setpoint = setpoint * cfg.gain * cfg.offset;
setpoint is provided via an Inport.
cfg is a tunable parameter defined as a Simulink.Parameter with a Bus type (ModelConfigBus) and configured via the Model Explorer.
Model configuration:
Solver: Fixed-step
Code Generation:
System target file: ert.tlc
Code interface packaging: Reusable function
Code is generated using Embedded Coder. In the generated code:
The ModelConfigBus struct is defined in experiment_demo_types.h as:
typedef struct {
real_T gain;
real_T offset;
} ModelConfigBus;
My goal is to pass the cfg parameter directly into the generated experiment_demo_step() function, so that it can be configured from an external source (e.g., another module or application). Ideally, I would like the struct to be declared in experiment_demo.h and used as an input argument in experiment_demo.c.
Questions:
What is the recommended way to expose a tunable struct parameter like cfg as an input to the step() function in the generated code?
Is there a configuration or customization (e.g., via code interface settings or TLC customization) that allows this struct to be passed explicitly to the step function?
Would moving the struct definition from experiment_demo_types.h to experiment_demo.h be supported or recommended for this use case?
Thank you! simulink, embeddedcoder, reusablefunction MATLAB Answers — New Questions

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Hello,
Does anybody know a (undocumented) workaround to have multiple nodes selected in a uitree with checkboxes? I like to distinguish between checked and selected items.
If the uitree component is used without checkboxes it is possible. I am wondering why this is not implemented (yet)…
hF = uifigure();
hT = uitree(hF,’checkbox’);

hO1 = uitreenode(Parent=hT, Text=’object1′);
hO2 = uitreenode(Parent=hT, Text=’object2′);
hO3 = uitreenode(Parent=hT, Text=’object3′);
hO4 = uitreenode(Parent=hT, Text=’object4′);

hT.CheckedNodes = [hO1, hO2];
hT.SelectedNodes = [hO3, hO4];

%Error using matlab.ui.container.internal.model.TreeComponent/set.SelectedNodes (line 161)
%’SelectedNodes’ must be an empty array or a 1-by-1 TreeNode object that is a child in the CheckBoxTree.
Thanks in advance,
MartinHello,
Does anybody know a (undocumented) workaround to have multiple nodes selected in a uitree with checkboxes? I like to distinguish between checked and selected items.
If the uitree component is used without checkboxes it is possible. I am wondering why this is not implemented (yet)…
hF = uifigure();
hT = uitree(hF,’checkbox’);

hO1 = uitreenode(Parent=hT, Text=’object1′);
hO2 = uitreenode(Parent=hT, Text=’object2′);
hO3 = uitreenode(Parent=hT, Text=’object3′);
hO4 = uitreenode(Parent=hT, Text=’object4′);

hT.CheckedNodes = [hO1, hO2];
hT.SelectedNodes = [hO3, hO4];

%Error using matlab.ui.container.internal.model.TreeComponent/set.SelectedNodes (line 161)
%’SelectedNodes’ must be an empty array or a 1-by-1 TreeNode object that is a child in the CheckBoxTree.
Thanks in advance,
Martin Hello,
Does anybody know a (undocumented) workaround to have multiple nodes selected in a uitree with checkboxes? I like to distinguish between checked and selected items.
If the uitree component is used without checkboxes it is possible. I am wondering why this is not implemented (yet)…
hF = uifigure();
hT = uitree(hF,’checkbox’);

hO1 = uitreenode(Parent=hT, Text=’object1′);
hO2 = uitreenode(Parent=hT, Text=’object2′);
hO3 = uitreenode(Parent=hT, Text=’object3′);
hO4 = uitreenode(Parent=hT, Text=’object4′);

hT.CheckedNodes = [hO1, hO2];
hT.SelectedNodes = [hO3, hO4];

%Error using matlab.ui.container.internal.model.TreeComponent/set.SelectedNodes (line 161)
%’SelectedNodes’ must be an empty array or a 1-by-1 TreeNode object that is a child in the CheckBoxTree.
Thanks in advance,
Martin uifigure, uitree, selectednodes MATLAB Answers — New Questions

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I used the method described here to save figures with a callback that would change their visibility to ‘on’ when opened.
fig = figure(‘Visible’,’off’);
set(fig, ‘CreateFcn’, ‘set(gcbo,”Visible”,”on”)’);
plot([1:10]);
savefig(fig,"C:temptest.fig")

close all
openfig("C:temptest.fig",’invisible’)
Behavior of sample code: figure opens and is visible
Desired Behavior: figure opens and is invisible.
Is this possible? Thank you.I used the method described here to save figures with a callback that would change their visibility to ‘on’ when opened.
fig = figure(‘Visible’,’off’);
set(fig, ‘CreateFcn’, ‘set(gcbo,”Visible”,”on”)’);
plot([1:10]);
savefig(fig,"C:temptest.fig")

close all
openfig("C:temptest.fig",’invisible’)
Behavior of sample code: figure opens and is visible
Desired Behavior: figure opens and is invisible.
Is this possible? Thank you. I used the method described here to save figures with a callback that would change their visibility to ‘on’ when opened.
fig = figure(‘Visible’,’off’);
set(fig, ‘CreateFcn’, ‘set(gcbo,”Visible”,”on”)’);
plot([1:10]);
savefig(fig,"C:temptest.fig")

close all
openfig("C:temptest.fig",’invisible’)
Behavior of sample code: figure opens and is visible
Desired Behavior: figure opens and is invisible.
Is this possible? Thank you. figure visibility MATLAB Answers — New Questions

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