I’ve been developing a custom controller using this toolbox, and everything has been working well after following the examples provided in the documentation.
However, after this last Tuesday, April 14th 2026, I attempted to monitor and tune my controller, and it threw an error saying the build failed and I need to go through the toolbox setup again (this is the first time I’ve gotten this error). I did this, and that is when problems developed. When using a simulink plant simulation for the PX4 SITL Host, the plant can no longer run in real time. It runs at about a quarter of the speed. I booted up the PX4 monitor and tune with plant example, and even that example is now running slowly too! Is it possible the recent security update affected TCP communication between Windows and the WSL network adapter?
Also, I am on R2025a.I’ve been developing a custom controller using this toolbox, and everything has been working well after following the examples provided in the documentation.
However, after this last Tuesday, April 14th 2026, I attempted to monitor and tune my controller, and it threw an error saying the build failed and I need to go through the toolbox setup again (this is the first time I’ve gotten this error). I did this, and that is when problems developed. When using a simulink plant simulation for the PX4 SITL Host, the plant can no longer run in real time. It runs at about a quarter of the speed. I booted up the PX4 monitor and tune with plant example, and even that example is now running slowly too! Is it possible the recent security update affected TCP communication between Windows and the WSL network adapter?
Also, I am on R2025a. I’ve been developing a custom controller using this toolbox, and everything has been working well after following the examples provided in the documentation.
However, after this last Tuesday, April 14th 2026, I attempted to monitor and tune my controller, and it threw an error saying the build failed and I need to go through the toolbox setup again (this is the first time I’ve gotten this error). I did this, and that is when problems developed. When using a simulink plant simulation for the PX4 SITL Host, the plant can no longer run in real time. It runs at about a quarter of the speed. I booted up the PX4 monitor and tune with plant example, and even that example is now running slowly too! Is it possible the recent security update affected TCP communication between Windows and the WSL network adapter?
Also, I am on R2025a. px4, uav toolbox support package, monitor and tune, simulink, plant MATLAB Answers — New Questions

​

I want to find out the Noise and vibration of an EV motor PMSM by given few input data and getting results. So what is the process in the matlab/simulink to get the resultsI want to find out the Noise and vibration of an EV motor PMSM by given few input data and getting results. So what is the process in the matlab/simulink to get the results I want to find out the Noise and vibration of an EV motor PMSM by given few input data and getting results. So what is the process in the matlab/simulink to get the results nvh of an ev motor MATLAB Answers — New Questions

​

I have hundreds of RGB images (one of the image is attached). For reference these are interference images and the RGB color values correspond to certain film thickness between a semi reflective glass surface and a steel surface. I apply electric potential across the surface and observed electric discharges which show as bright spots on the image (highlighted in red circle in attached image).
I want to write a script in MATLAB (2023a) that goes through the images, identify these bright spots stores there location in the XY cordinate system. The end goal is to show spatial distribution of the electric discharges.I have hundreds of RGB images (one of the image is attached). For reference these are interference images and the RGB color values correspond to certain film thickness between a semi reflective glass surface and a steel surface. I apply electric potential across the surface and observed electric discharges which show as bright spots on the image (highlighted in red circle in attached image).
I want to write a script in MATLAB (2023a) that goes through the images, identify these bright spots stores there location in the XY cordinate system. The end goal is to show spatial distribution of the electric discharges. I have hundreds of RGB images (one of the image is attached). For reference these are interference images and the RGB color values correspond to certain film thickness between a semi reflective glass surface and a steel surface. I apply electric potential across the surface and observed electric discharges which show as bright spots on the image (highlighted in red circle in attached image).
I want to write a script in MATLAB (2023a) that goes through the images, identify these bright spots stores there location in the XY cordinate system. The end goal is to show spatial distribution of the electric discharges. image analysis, image processing MATLAB Answers — New Questions

​

Hi,
after new instalation of MATLAB 2025b my program does not use function plot properly.
After command "plot(x)" MATLAB opens new window "Figures" as usual but there is no figure.
After this line program continues execution.
I could not find the explanation jet.
Thanks!Hi,
after new instalation of MATLAB 2025b my program does not use function plot properly.
After command "plot(x)" MATLAB opens new window "Figures" as usual but there is no figure.
After this line program continues execution.
I could not find the explanation jet.
Thanks! Hi,
after new instalation of MATLAB 2025b my program does not use function plot properly.
After command "plot(x)" MATLAB opens new window "Figures" as usual but there is no figure.
After this line program continues execution.
I could not find the explanation jet.
Thanks! plot, figures MATLAB Answers — New Questions

​

Hello together,

I am facing a strange behaviour of my Simulink model. That model is comprised of a Simscape subsystem and a Stateflow subsystem. The latter is used to controll the operation mode of the Simscape model.

For a clear data transfer I implemented several data buses as Stateflow inputs and outputs. For that, I created the necessary Simulink Bus Objects and it works fine so far. But when I want to use one field of the Getoperationdata bus to describe the transition condition, the transition is not exceeded despite the condition is true (as shown in the figure below). The state Empty_Pump_Chamber remains active but should switch to Empty_Complete.

The Getoperationdata bus is implemented as an output bus. When defining a transition condition with a variable from another input bus, the model succeeds. Very strange. Even when I define a local variable, set this variable equal to Getoperationaldata.emptyComplete2 and use this new variable to state the transition condition, the model succeeds. Very strange! What is wrong?

Kind Regards!Hello together,

I am facing a strange behaviour of my Simulink model. That model is comprised of a Simscape subsystem and a Stateflow subsystem. The latter is used to controll the operation mode of the Simscape model.

For a clear data transfer I implemented several data buses as Stateflow inputs and outputs. For that, I created the necessary Simulink Bus Objects and it works fine so far. But when I want to use one field of the Getoperationdata bus to describe the transition condition, the transition is not exceeded despite the condition is true (as shown in the figure below). The state Empty_Pump_Chamber remains active but should switch to Empty_Complete.

The Getoperationdata bus is implemented as an output bus. When defining a transition condition with a variable from another input bus, the model succeeds. Very strange. Even when I define a local variable, set this variable equal to Getoperationaldata.emptyComplete2 and use this new variable to state the transition condition, the model succeeds. Very strange! What is wrong?

Kind Regards! Hello together,

I am facing a strange behaviour of my Simulink model. That model is comprised of a Simscape subsystem and a Stateflow subsystem. The latter is used to controll the operation mode of the Simscape model.

For a clear data transfer I implemented several data buses as Stateflow inputs and outputs. For that, I created the necessary Simulink Bus Objects and it works fine so far. But when I want to use one field of the Getoperationdata bus to describe the transition condition, the transition is not exceeded despite the condition is true (as shown in the figure below). The state Empty_Pump_Chamber remains active but should switch to Empty_Complete.

The Getoperationdata bus is implemented as an output bus. When defining a transition condition with a variable from another input bus, the model succeeds. Very strange. Even when I define a local variable, set this variable equal to Getoperationaldata.emptyComplete2 and use this new variable to state the transition condition, the model succeeds. Very strange! What is wrong?

Kind Regards! simulink bus object, transition MATLAB Answers — New Questions

​

I am training a DDPG agent using a simulink environment. I want to log the last (final) value of a specific signal for every evaluation episode, e.g., if there are 10 evaluation episodes then I will have 10 values, possibly in the form of an array. The agent is unaware of this signal. How can I do this?I am training a DDPG agent using a simulink environment. I want to log the last (final) value of a specific signal for every evaluation episode, e.g., if there are 10 evaluation episodes then I will have 10 values, possibly in the form of an array. The agent is unaware of this signal. How can I do this? I am training a DDPG agent using a simulink environment. I want to log the last (final) value of a specific signal for every evaluation episode, e.g., if there are 10 evaluation episodes then I will have 10 values, possibly in the form of an array. The agent is unaware of this signal. How can I do this? simulink, reinforcement learning MATLAB Answers — New Questions

​

The code for the textscatter example at
textscatter – 2-D scatter plot of text – MATLAB
looks like it should produce text at those random points. Instead the figure there shows some text in unusual places, some points that dont belong to any specific label, and in general, the whole thing is mysterious.The code for the textscatter example at
textscatter – 2-D scatter plot of text – MATLAB
looks like it should produce text at those random points. Instead the figure there shows some text in unusual places, some points that dont belong to any specific label, and in general, the whole thing is mysterious. The code for the textscatter example at
textscatter – 2-D scatter plot of text – MATLAB
looks like it should produce text at those random points. Instead the figure there shows some text in unusual places, some points that dont belong to any specific label, and in general, the whole thing is mysterious. textscatter MATLAB Answers — New Questions

​

Hello Everyone!

I am having a strange problem with the app designer right now:

Every time I start the app designer and load the .mlapp-File of the Project I’m currently working on, there are multiple instances of the same EditField created. It began with only one copy of an EditField I manually added on the GUI. I didn’t think much about it and simply deleted the second instance. But it seems like this problem has grown exponentially with every start of app designer. Now, when I open up my Project 500 (!!) EditFields with the same name are created! ‘Simply’ deleting all of them is obviously not anymore an acceptable workaround – especially since ‘ctrl+a’ doesn’t work in the Component Browser and you have to selected them all manually…

I have no idea why the app designer creates these multiple instances on the startup – after I deleted all multiple instances, they also didn’t appear in the non-editable Function ‘createComponents(app)’ anymore.

Does anyone of you have an idea on that? Where in my code could be a bug causing this phenomenon? Or could this be an appdesigner-internal bug? The project itself is already quite big with ~260 components even without those multiple and unwanted EditFields…

I’m desperately looking for your help! Thanks a lot in advance.Hello Everyone!

I am having a strange problem with the app designer right now:

Every time I start the app designer and load the .mlapp-File of the Project I’m currently working on, there are multiple instances of the same EditField created. It began with only one copy of an EditField I manually added on the GUI. I didn’t think much about it and simply deleted the second instance. But it seems like this problem has grown exponentially with every start of app designer. Now, when I open up my Project 500 (!!) EditFields with the same name are created! ‘Simply’ deleting all of them is obviously not anymore an acceptable workaround – especially since ‘ctrl+a’ doesn’t work in the Component Browser and you have to selected them all manually…

I have no idea why the app designer creates these multiple instances on the startup – after I deleted all multiple instances, they also didn’t appear in the non-editable Function ‘createComponents(app)’ anymore.

Does anyone of you have an idea on that? Where in my code could be a bug causing this phenomenon? Or could this be an appdesigner-internal bug? The project itself is already quite big with ~260 components even without those multiple and unwanted EditFields…

I’m desperately looking for your help! Thanks a lot in advance. Hello Everyone!

I am having a strange problem with the app designer right now:

Every time I start the app designer and load the .mlapp-File of the Project I’m currently working on, there are multiple instances of the same EditField created. It began with only one copy of an EditField I manually added on the GUI. I didn’t think much about it and simply deleted the second instance. But it seems like this problem has grown exponentially with every start of app designer. Now, when I open up my Project 500 (!!) EditFields with the same name are created! ‘Simply’ deleting all of them is obviously not anymore an acceptable workaround – especially since ‘ctrl+a’ doesn’t work in the Component Browser and you have to selected them all manually…

I have no idea why the app designer creates these multiple instances on the startup – after I deleted all multiple instances, they also didn’t appear in the non-editable Function ‘createComponents(app)’ anymore.

Does anyone of you have an idea on that? Where in my code could be a bug causing this phenomenon? Or could this be an appdesigner-internal bug? The project itself is already quite big with ~260 components even without those multiple and unwanted EditFields…

I’m desperately looking for your help! Thanks a lot in advance. appdesigner, gui MATLAB Answers — New Questions

​

tic
syms x y m %alpha beta b lambda eta phi
phi=sqrt(0.5)
b=10
eta=1
alpha=2;
beta=1;
T=zeros(1,2,’sym’);
G=zeros(1,2,’sym’);
A=zeros(1,’sym’);
B=zeros(1,’sym’);
C=zeros(1,’sym’);
D=zeros(1,’sym’);
E=zeros(1,’sym’);
F=zeros(1,’sym’);
G_val=zeros(1,’sym’);
series(x)=sym(zeros(1,1));
series1(x)=sym(zeros(1,1));
% Transform Initial condition
T(1)=m;
T(2)=0;
% Initial transform value of exp function

for i=1:4
G(i)=y;
if i==1
E(1)=exp((eta*T(1))/(eta+T(1)));
else
A(1)=0;
for j=1:i-1
E(i)=A(1)+(j/(i-1))*G(j)*E(i-j);
end
B(1)=0;
for j=1:i
B(1)=B(1)+T(j)*G(i-j+1);
end
eq1=G(i)-T(i)+(1/eta)*B(1);
G_val=simplify(solve(eq1,y));
G(i)=simplify(G_val);
E_val=subs(E(i),y,G_val);
E(i)=E_val
end
C(1)=0
for r=1:i
C(1)=C(1)+T(r)*E(i-r+1);
end
T(i + alpha*beta) = (phi^2*C(1)-b*phi^2*E(i))*(gamma(1+(sym(i-1)/beta))/gamma(1+alpha+(sym(i-1)/beta)));
%T(i+2)=simplify((1/(i*(i+1)))*(phi^2*C(1)-b*phi^2*E(i)));
end

for k=1:3
series(x)=simplify(series(x)+T(k)*(power(x,((k-1)*beta))));
end
series
e1=subs(series,x,1);
format long
accuracy=input(‘enter the accuracy’)
f=e1(x)
g=inline(f)
a=input(‘enter the ist approximation=’)
b=input(‘enter the 2nd approximation=’)
fa=feval(g,a)
fb=feval(g,b)
while fa*fb>0
a=input(‘enter the ist approximation=’)
b=input(‘enter the 2nd approximation=’)
fa=feval(g,a)
fb=feval(g,b)
end
for i=1:50
c=(a+b)/2;
fc=feval(g,c);
disp([i a fa b fb c fc abs(b-a)])
if fc==accuracy
fprintf(‘the root of the equation is %f’,c)
break;
elseif abs(b-a)<=accuracy
fprintf(‘the root of the equation is %f’,c)
break;
elseif fa*fc<=0
b=c;
fb=fc;
else
a=c;
fa=fc;
end
end
fprintf(‘the value of c=%f’, c);
series1(x)=subs(series,m,c)
residualError=sym(zeros(1,1));
residual=sym(zeros(1,1));
residualError(x) = abs(diff(series1,x,2)+ B*phi^2*(1-(series1)/B)*exp((eta*series1)/(eta+series1)))
residual_error=double(subs(residualError,x,0.2))
var =double(residual_error);
x=0:0.1:1
error=zeros(1)
row=0;
for i=1:length(x)
row=row+1;
error(row)=(residualErrorx(i))
max_error=max(error)
end
fprintf(‘The residual error is %fn’, max_error);
%—————————————————————–
the error appear as Error using mupadengine/evalin2double
Unable to convert expression containing symbolic variables into double array. Apply ‘subs’ function first to substitute values for variables.

Error in mupadengine/feval2double

Error in sym/double (line 756)
X = feval2double(symengine, "symobj::doubleDirect", S);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Related documentation
now i substutite the value of m using sysntax series1(x)=subs(series,m,c) but when i later on call series 1 in line residualError(x) = abs(diff(series1,x,2)+ B*phi^2*(1-(series1)/B)*exp((eta*series1)/(eta+series1))) the final expression is having m and y . That is symbolic and craet an errortic
syms x y m %alpha beta b lambda eta phi
phi=sqrt(0.5)
b=10
eta=1
alpha=2;
beta=1;
T=zeros(1,2,’sym’);
G=zeros(1,2,’sym’);
A=zeros(1,’sym’);
B=zeros(1,’sym’);
C=zeros(1,’sym’);
D=zeros(1,’sym’);
E=zeros(1,’sym’);
F=zeros(1,’sym’);
G_val=zeros(1,’sym’);
series(x)=sym(zeros(1,1));
series1(x)=sym(zeros(1,1));
% Transform Initial condition
T(1)=m;
T(2)=0;
% Initial transform value of exp function

for i=1:4
G(i)=y;
if i==1
E(1)=exp((eta*T(1))/(eta+T(1)));
else
A(1)=0;
for j=1:i-1
E(i)=A(1)+(j/(i-1))*G(j)*E(i-j);
end
B(1)=0;
for j=1:i
B(1)=B(1)+T(j)*G(i-j+1);
end
eq1=G(i)-T(i)+(1/eta)*B(1);
G_val=simplify(solve(eq1,y));
G(i)=simplify(G_val);
E_val=subs(E(i),y,G_val);
E(i)=E_val
end
C(1)=0
for r=1:i
C(1)=C(1)+T(r)*E(i-r+1);
end
T(i + alpha*beta) = (phi^2*C(1)-b*phi^2*E(i))*(gamma(1+(sym(i-1)/beta))/gamma(1+alpha+(sym(i-1)/beta)));
%T(i+2)=simplify((1/(i*(i+1)))*(phi^2*C(1)-b*phi^2*E(i)));
end

for k=1:3
series(x)=simplify(series(x)+T(k)*(power(x,((k-1)*beta))));
end
series
e1=subs(series,x,1);
format long
accuracy=input(‘enter the accuracy’)
f=e1(x)
g=inline(f)
a=input(‘enter the ist approximation=’)
b=input(‘enter the 2nd approximation=’)
fa=feval(g,a)
fb=feval(g,b)
while fa*fb>0
a=input(‘enter the ist approximation=’)
b=input(‘enter the 2nd approximation=’)
fa=feval(g,a)
fb=feval(g,b)
end
for i=1:50
c=(a+b)/2;
fc=feval(g,c);
disp([i a fa b fb c fc abs(b-a)])
if fc==accuracy
fprintf(‘the root of the equation is %f’,c)
break;
elseif abs(b-a)<=accuracy
fprintf(‘the root of the equation is %f’,c)
break;
elseif fa*fc<=0
b=c;
fb=fc;
else
a=c;
fa=fc;
end
end
fprintf(‘the value of c=%f’, c);
series1(x)=subs(series,m,c)
residualError=sym(zeros(1,1));
residual=sym(zeros(1,1));
residualError(x) = abs(diff(series1,x,2)+ B*phi^2*(1-(series1)/B)*exp((eta*series1)/(eta+series1)))
residual_error=double(subs(residualError,x,0.2))
var =double(residual_error);
x=0:0.1:1
error=zeros(1)
row=0;
for i=1:length(x)
row=row+1;
error(row)=(residualErrorx(i))
max_error=max(error)
end
fprintf(‘The residual error is %fn’, max_error);
%—————————————————————–
the error appear as Error using mupadengine/evalin2double
Unable to convert expression containing symbolic variables into double array. Apply ‘subs’ function first to substitute values for variables.

Error in mupadengine/feval2double

Error in sym/double (line 756)
X = feval2double(symengine, "symobj::doubleDirect", S);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Related documentation
now i substutite the value of m using sysntax series1(x)=subs(series,m,c) but when i later on call series 1 in line residualError(x) = abs(diff(series1,x,2)+ B*phi^2*(1-(series1)/B)*exp((eta*series1)/(eta+series1))) the final expression is having m and y . That is symbolic and craet an error tic
syms x y m %alpha beta b lambda eta phi
phi=sqrt(0.5)
b=10
eta=1
alpha=2;
beta=1;
T=zeros(1,2,’sym’);
G=zeros(1,2,’sym’);
A=zeros(1,’sym’);
B=zeros(1,’sym’);
C=zeros(1,’sym’);
D=zeros(1,’sym’);
E=zeros(1,’sym’);
F=zeros(1,’sym’);
G_val=zeros(1,’sym’);
series(x)=sym(zeros(1,1));
series1(x)=sym(zeros(1,1));
% Transform Initial condition
T(1)=m;
T(2)=0;
% Initial transform value of exp function

for i=1:4
G(i)=y;
if i==1
E(1)=exp((eta*T(1))/(eta+T(1)));
else
A(1)=0;
for j=1:i-1
E(i)=A(1)+(j/(i-1))*G(j)*E(i-j);
end
B(1)=0;
for j=1:i
B(1)=B(1)+T(j)*G(i-j+1);
end
eq1=G(i)-T(i)+(1/eta)*B(1);
G_val=simplify(solve(eq1,y));
G(i)=simplify(G_val);
E_val=subs(E(i),y,G_val);
E(i)=E_val
end
C(1)=0
for r=1:i
C(1)=C(1)+T(r)*E(i-r+1);
end
T(i + alpha*beta) = (phi^2*C(1)-b*phi^2*E(i))*(gamma(1+(sym(i-1)/beta))/gamma(1+alpha+(sym(i-1)/beta)));
%T(i+2)=simplify((1/(i*(i+1)))*(phi^2*C(1)-b*phi^2*E(i)));
end

for k=1:3
series(x)=simplify(series(x)+T(k)*(power(x,((k-1)*beta))));
end
series
e1=subs(series,x,1);
format long
accuracy=input(‘enter the accuracy’)
f=e1(x)
g=inline(f)
a=input(‘enter the ist approximation=’)
b=input(‘enter the 2nd approximation=’)
fa=feval(g,a)
fb=feval(g,b)
while fa*fb>0
a=input(‘enter the ist approximation=’)
b=input(‘enter the 2nd approximation=’)
fa=feval(g,a)
fb=feval(g,b)
end
for i=1:50
c=(a+b)/2;
fc=feval(g,c);
disp([i a fa b fb c fc abs(b-a)])
if fc==accuracy
fprintf(‘the root of the equation is %f’,c)
break;
elseif abs(b-a)<=accuracy
fprintf(‘the root of the equation is %f’,c)
break;
elseif fa*fc<=0
b=c;
fb=fc;
else
a=c;
fa=fc;
end
end
fprintf(‘the value of c=%f’, c);
series1(x)=subs(series,m,c)
residualError=sym(zeros(1,1));
residual=sym(zeros(1,1));
residualError(x) = abs(diff(series1,x,2)+ B*phi^2*(1-(series1)/B)*exp((eta*series1)/(eta+series1)))
residual_error=double(subs(residualError,x,0.2))
var =double(residual_error);
x=0:0.1:1
error=zeros(1)
row=0;
for i=1:length(x)
row=row+1;
error(row)=(residualErrorx(i))
max_error=max(error)
end
fprintf(‘The residual error is %fn’, max_error);
%—————————————————————–
the error appear as Error using mupadengine/evalin2double
Unable to convert expression containing symbolic variables into double array. Apply ‘subs’ function first to substitute values for variables.

Error in mupadengine/feval2double

Error in sym/double (line 756)
X = feval2double(symengine, "symobj::doubleDirect", S);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Related documentation
now i substutite the value of m using sysntax series1(x)=subs(series,m,c) but when i later on call series 1 in line residualError(x) = abs(diff(series1,x,2)+ B*phi^2*(1-(series1)/B)*exp((eta*series1)/(eta+series1))) the final expression is having m and y . That is symbolic and craet an error symbolic compuational MATLAB Answers — New Questions

​

I am trying to calculate small numbers from equations like the one below.

p = -1e17 + sqrt(1e34 + 1e18)

I have tried using ‘vpa(-1e17 + sqrt(1e34 + 1e18), 30) but the output always comes out as p = 0.0. But p is not exactly zero and this propagates errors in subsequent calculations that involve p. Is there another way to retain sig figs to avoid rounding errors?I am trying to calculate small numbers from equations like the one below.

p = -1e17 + sqrt(1e34 + 1e18)

I have tried using ‘vpa(-1e17 + sqrt(1e34 + 1e18), 30) but the output always comes out as p = 0.0. But p is not exactly zero and this propagates errors in subsequent calculations that involve p. Is there another way to retain sig figs to avoid rounding errors? I am trying to calculate small numbers from equations like the one below.

p = -1e17 + sqrt(1e34 + 1e18)

I have tried using ‘vpa(-1e17 + sqrt(1e34 + 1e18), 30) but the output always comes out as p = 0.0. But p is not exactly zero and this propagates errors in subsequent calculations that involve p. Is there another way to retain sig figs to avoid rounding errors? precision, digits MATLAB Answers — New Questions

​