I am trying to figure out pdepe and how to use it to solve a higher order equation written as multiple second order equations. Even though I am trying to solve a more complex equation in the future I want to start with a simple case
.
My idea is to rewrite it by including a second variable

where
.
I chose the spatial coordinate to range from x=linsapce(0,2*pi,N) to ensure that my initial conditions satisfy my boundary conditions (see below).
In pdepe terms I wrote
function [c,f,s] = pdex1pde(x,t,u,dudx)
global D
c = [1 ; 0];
f = [D*dudx(2); dudx(1)];
s = [0; -u(2)]; %where q=u(2);
end
and providing some initial condition (from 0 to 2pi)
function u0 = pdex1ic(x)
init = 1-cos(x);
d2init_dx2 = cos(x);

u0 = [init; d2init_dx2]
end
For the boundary conditions I just used a Neumann boundary for each boundary
function [pl,ql,pr,qr] = pdex1bc(xl,ul,xr,ur,t)
pl = [0;0];
ql = [1;1];
pr = [0;0];
qr = [1;1];
end

Now pdepe gives me a warning that it could not converge at time t=0 and I don’t get a result.
Is there something that I am missing?
I had a look at other questions about this topic and already stumbled upon this github page (https://github.com/wgreene310/pdepe-examples), but I don’t really understand it without the written equations.
Thank you very much for answering.I am trying to figure out pdepe and how to use it to solve a higher order equation written as multiple second order equations. Even though I am trying to solve a more complex equation in the future I want to start with a simple case
.
My idea is to rewrite it by including a second variable

where
.
I chose the spatial coordinate to range from x=linsapce(0,2*pi,N) to ensure that my initial conditions satisfy my boundary conditions (see below).
In pdepe terms I wrote
function [c,f,s] = pdex1pde(x,t,u,dudx)
global D
c = [1 ; 0];
f = [D*dudx(2); dudx(1)];
s = [0; -u(2)]; %where q=u(2);
end
and providing some initial condition (from 0 to 2pi)
function u0 = pdex1ic(x)
init = 1-cos(x);
d2init_dx2 = cos(x);

u0 = [init; d2init_dx2]
end
For the boundary conditions I just used a Neumann boundary for each boundary
function [pl,ql,pr,qr] = pdex1bc(xl,ul,xr,ur,t)
pl = [0;0];
ql = [1;1];
pr = [0;0];
qr = [1;1];
end

Now pdepe gives me a warning that it could not converge at time t=0 and I don’t get a result.
Is there something that I am missing?
I had a look at other questions about this topic and already stumbled upon this github page (https://github.com/wgreene310/pdepe-examples), but I don’t really understand it without the written equations.
Thank you very much for answering. I am trying to figure out pdepe and how to use it to solve a higher order equation written as multiple second order equations. Even though I am trying to solve a more complex equation in the future I want to start with a simple case
.
My idea is to rewrite it by including a second variable

where
.
I chose the spatial coordinate to range from x=linsapce(0,2*pi,N) to ensure that my initial conditions satisfy my boundary conditions (see below).
In pdepe terms I wrote
function [c,f,s] = pdex1pde(x,t,u,dudx)
global D
c = [1 ; 0];
f = [D*dudx(2); dudx(1)];
s = [0; -u(2)]; %where q=u(2);
end
and providing some initial condition (from 0 to 2pi)
function u0 = pdex1ic(x)
init = 1-cos(x);
d2init_dx2 = cos(x);

u0 = [init; d2init_dx2]
end
For the boundary conditions I just used a Neumann boundary for each boundary
function [pl,ql,pr,qr] = pdex1bc(xl,ul,xr,ur,t)
pl = [0;0];
ql = [1;1];
pr = [0;0];
qr = [1;1];
end

Now pdepe gives me a warning that it could not converge at time t=0 and I don’t get a result.
Is there something that I am missing?
I had a look at other questions about this topic and already stumbled upon this github page (https://github.com/wgreene310/pdepe-examples), but I don’t really understand it without the written equations.
Thank you very much for answering. pdepe, pde, system of equations MATLAB Answers — New Questions

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will the PAPR(Peak to Average Power Ratio) of OFDM (Orthogonal Frequency Division Multiplexing) be effected if we use different modulation schemes?
1) effect on PAPR using M-QAM
2) effect on PAPR using M-PSKwill the PAPR(Peak to Average Power Ratio) of OFDM (Orthogonal Frequency Division Multiplexing) be effected if we use different modulation schemes?
1) effect on PAPR using M-QAM
2) effect on PAPR using M-PSK will the PAPR(Peak to Average Power Ratio) of OFDM (Orthogonal Frequency Division Multiplexing) be effected if we use different modulation schemes?
1) effect on PAPR using M-QAM
2) effect on PAPR using M-PSK papr of ofdm, papr (peak to average power ratio) of ofdm(orthogonal frequency division multiplexing) MATLAB Answers — New Questions

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Hi,

I have a problem when using multivariate regression function (mvregress) available in matlab.
I have a cell array with 20 cells in each of which there are three values as inputs and my target output is a vector with 20 values. When I load this data and call mvregress function, it gives the error: "Undefined function ‘isnan’ for input arguments of type ‘cell’."

To eliminate this problem I tried using: data = cellfun(@isnan,originaldata,’UniformOutput’,false)

But this makes all my values zero.

My code is given below:

load mywork1.mat
[beta,Sigma, resid] = mvregress(targetvalues’,originaldata)

Since it gives the error ("Undefined function ‘isnan’ for input arguments of type ‘cell’."), I tried the following

data = cellfun(@isnan,originaldata,’UniformOutput’,false)

But then all my data cells are replaced with zeros.

How can I resolve this issue and perform multivariate regression on these data?
I have attached the data set.
Thank you in advance.Hi,

I have a problem when using multivariate regression function (mvregress) available in matlab.
I have a cell array with 20 cells in each of which there are three values as inputs and my target output is a vector with 20 values. When I load this data and call mvregress function, it gives the error: "Undefined function ‘isnan’ for input arguments of type ‘cell’."

To eliminate this problem I tried using: data = cellfun(@isnan,originaldata,’UniformOutput’,false)

But this makes all my values zero.

My code is given below:

load mywork1.mat
[beta,Sigma, resid] = mvregress(targetvalues’,originaldata)

Since it gives the error ("Undefined function ‘isnan’ for input arguments of type ‘cell’."), I tried the following

data = cellfun(@isnan,originaldata,’UniformOutput’,false)

But then all my data cells are replaced with zeros.

How can I resolve this issue and perform multivariate regression on these data?
I have attached the data set.
Thank you in advance. Hi,

I have a problem when using multivariate regression function (mvregress) available in matlab.
I have a cell array with 20 cells in each of which there are three values as inputs and my target output is a vector with 20 values. When I load this data and call mvregress function, it gives the error: "Undefined function ‘isnan’ for input arguments of type ‘cell’."

To eliminate this problem I tried using: data = cellfun(@isnan,originaldata,’UniformOutput’,false)

But this makes all my values zero.

My code is given below:

load mywork1.mat
[beta,Sigma, resid] = mvregress(targetvalues’,originaldata)

Since it gives the error ("Undefined function ‘isnan’ for input arguments of type ‘cell’."), I tried the following

data = cellfun(@isnan,originaldata,’UniformOutput’,false)

But then all my data cells are replaced with zeros.

How can I resolve this issue and perform multivariate regression on these data?
I have attached the data set.
Thank you in advance. regression, mvregress, isnan MATLAB Answers — New Questions

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Hi,
I’m would like to have a date picker window on my main app window, and I’d like something to happen whenever the date is changed. The help file says I can call a function using the ‘ValueChangedFcn’ callback, but I can’t get it to work. This is the relevant piece of code:
methods (Access = private)

function test(app)
uialert(app.UIFigure, ‘It works!’, ‘It works!’, ‘Icon’,’help’);
end

end

methods (Access = private)

% Code that executes after component creation
function startupFcn(app)

uidatepicker(app.UIFigure, ‘Position’, [780 350 100 22], ‘ValueChangedFcn’, test(app))

I get this error message – Error using app1/test
Too many output arguments.

Error in app1 (line 431)
runStartupFcn(app, @startupFcn)

Any ideas?Hi,
I’m would like to have a date picker window on my main app window, and I’d like something to happen whenever the date is changed. The help file says I can call a function using the ‘ValueChangedFcn’ callback, but I can’t get it to work. This is the relevant piece of code:
methods (Access = private)

function test(app)
uialert(app.UIFigure, ‘It works!’, ‘It works!’, ‘Icon’,’help’);
end

end

methods (Access = private)

% Code that executes after component creation
function startupFcn(app)

uidatepicker(app.UIFigure, ‘Position’, [780 350 100 22], ‘ValueChangedFcn’, test(app))

I get this error message – Error using app1/test
Too many output arguments.

Error in app1 (line 431)
runStartupFcn(app, @startupFcn)

Any ideas? Hi,
I’m would like to have a date picker window on my main app window, and I’d like something to happen whenever the date is changed. The help file says I can call a function using the ‘ValueChangedFcn’ callback, but I can’t get it to work. This is the relevant piece of code:
methods (Access = private)

function test(app)
uialert(app.UIFigure, ‘It works!’, ‘It works!’, ‘Icon’,’help’);
end

end

methods (Access = private)

% Code that executes after component creation
function startupFcn(app)

uidatepicker(app.UIFigure, ‘Position’, [780 350 100 22], ‘ValueChangedFcn’, test(app))

I get this error message – Error using app1/test
Too many output arguments.

Error in app1 (line 431)
runStartupFcn(app, @startupFcn)

Any ideas? valuechangedfcn, uidatepicker MATLAB Answers — New Questions

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Dear sir,
I am working on Watermarking. I divided a color host image into blocks using mat2cell. i hid watermark images in respective blocks. i wanted to know how i can recombine the watermarked blocks?Dear sir,
I am working on Watermarking. I divided a color host image into blocks using mat2cell. i hid watermark images in respective blocks. i wanted to know how i can recombine the watermarked blocks? Dear sir,
I am working on Watermarking. I divided a color host image into blocks using mat2cell. i hid watermark images in respective blocks. i wanted to know how i can recombine the watermarked blocks? watermarking, mat2cell MATLAB Answers — New Questions

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A few days ago someone pointed out that using:
clc; clear; close all;
Is considered as a case of code smell and cargo cult programming.
But does that really have to be the case?
clc: cleans up the command window and now one can work without getting confused with the commands for previous runs
clear: erases the variables from previous runs this will reduce chances of error in subsequent runs and the programmer does not have to worry about unnecessary trash variables.
close all: closes all currently open figures. This can be very helpful during subsequent runs of the same script. If the figure from the previous run has not been closed then the subsequent run will plot the data on the already open figure. Which of course is a total waste.

What is the problem with using these commands?A few days ago someone pointed out that using:
clc; clear; close all;
Is considered as a case of code smell and cargo cult programming.
But does that really have to be the case?
clc: cleans up the command window and now one can work without getting confused with the commands for previous runs
clear: erases the variables from previous runs this will reduce chances of error in subsequent runs and the programmer does not have to worry about unnecessary trash variables.
close all: closes all currently open figures. This can be very helpful during subsequent runs of the same script. If the figure from the previous run has not been closed then the subsequent run will plot the data on the already open figure. Which of course is a total waste.

What is the problem with using these commands? A few days ago someone pointed out that using:
clc; clear; close all;
Is considered as a case of code smell and cargo cult programming.
But does that really have to be the case?
clc: cleans up the command window and now one can work without getting confused with the commands for previous runs
clear: erases the variables from previous runs this will reduce chances of error in subsequent runs and the programmer does not have to worry about unnecessary trash variables.
close all: closes all currently open figures. This can be very helpful during subsequent runs of the same script. If the figure from the previous run has not been closed then the subsequent run will plot the data on the already open figure. Which of course is a total waste.

What is the problem with using these commands? codesmell, cargocultprogramming, clc, clear, close all MATLAB Answers — New Questions

​

Hi,
I want to create a lookup table that based on some inputs, where the indeces of the lookup table are found and the field value is output.
I attach the lookup table I made with its corresponding breakpoints.
I am using two Preelokup blocks to find the indeces of this 2D table. These indices are used then as input to the Direct LookupTable block (see the attached block diagram picture).
My issue is that if I input e.g., 28 in "in1", the index found is correct. However, if I put a value within two breakpoint values (e.g., 30) it uses interpolation, flat or rounding, and I would like to avoid that. Is there a way where if the input value does not match with any of the breakpoints array it simply does not return any index or the Lookup table simply returns no value or a zero?
Thanks in advanceHi,
I want to create a lookup table that based on some inputs, where the indeces of the lookup table are found and the field value is output.
I attach the lookup table I made with its corresponding breakpoints.
I am using two Preelokup blocks to find the indeces of this 2D table. These indices are used then as input to the Direct LookupTable block (see the attached block diagram picture).
My issue is that if I input e.g., 28 in "in1", the index found is correct. However, if I put a value within two breakpoint values (e.g., 30) it uses interpolation, flat or rounding, and I would like to avoid that. Is there a way where if the input value does not match with any of the breakpoints array it simply does not return any index or the Lookup table simply returns no value or a zero?
Thanks in advance Hi,
I want to create a lookup table that based on some inputs, where the indeces of the lookup table are found and the field value is output.
I attach the lookup table I made with its corresponding breakpoints.
I am using two Preelokup blocks to find the indeces of this 2D table. These indices are used then as input to the Direct LookupTable block (see the attached block diagram picture).
My issue is that if I input e.g., 28 in "in1", the index found is correct. However, if I put a value within two breakpoint values (e.g., 30) it uses interpolation, flat or rounding, and I would like to avoid that. Is there a way where if the input value does not match with any of the breakpoints array it simply does not return any index or the Lookup table simply returns no value or a zero?
Thanks in advance simulink, lookuptable MATLAB Answers — New Questions

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I’ve changed the equations I’d like to use for the resistor, dc voltage source and dc current source to a quadratic formula by going to the "source code" when clicking on the element properties, as this electrical circuit will actually be an analogy for a mechanical circuit.
However, it is not performing as I expect, with a negative current in one branch of the circuit.
So to understand what could be the issue, I clicked on performance adviser and get the failed to get cache error shown in the title of the question.

When I click on Model Adviser I also get:
Error occurred during model compile.

Error during code generation: Dot indexing is not supported for variables of this type.

The circuit is too big to take a screenshot of when zooming out without some parts becoming invisible.
I changed the equations to be V = I^2*R and P = I^3*R.I’ve changed the equations I’d like to use for the resistor, dc voltage source and dc current source to a quadratic formula by going to the "source code" when clicking on the element properties, as this electrical circuit will actually be an analogy for a mechanical circuit.
However, it is not performing as I expect, with a negative current in one branch of the circuit.
So to understand what could be the issue, I clicked on performance adviser and get the failed to get cache error shown in the title of the question.

When I click on Model Adviser I also get:
Error occurred during model compile.

Error during code generation: Dot indexing is not supported for variables of this type.

The circuit is too big to take a screenshot of when zooming out without some parts becoming invisible.
I changed the equations to be V = I^2*R and P = I^3*R. I’ve changed the equations I’d like to use for the resistor, dc voltage source and dc current source to a quadratic formula by going to the "source code" when clicking on the element properties, as this electrical circuit will actually be an analogy for a mechanical circuit.
However, it is not performing as I expect, with a negative current in one branch of the circuit.
So to understand what could be the issue, I clicked on performance adviser and get the failed to get cache error shown in the title of the question.

When I click on Model Adviser I also get:
Error occurred during model compile.

Error during code generation: Dot indexing is not supported for variables of this type.

The circuit is too big to take a screenshot of when zooming out without some parts becoming invisible.
I changed the equations to be V = I^2*R and P = I^3*R. error, dmr, dot indexing, simulink, code generation MATLAB Answers — New Questions

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Hello,

I have downloaded the embedded coder pack for TI c2000 processor, but while configuring it is asking the toolchain of CCS.
I have CCS of version 10.4.0, but in the drop down option list option showing with version upto 6, and then when I select the CCS v6 and try to validate it, it is showing error message like readme text file not found.

is it required to download lower version of CCS to complete this setup?Hello,

I have downloaded the embedded coder pack for TI c2000 processor, but while configuring it is asking the toolchain of CCS.
I have CCS of version 10.4.0, but in the drop down option list option showing with version upto 6, and then when I select the CCS v6 and try to validate it, it is showing error message like readme text file not found.

is it required to download lower version of CCS to complete this setup? Hello,

I have downloaded the embedded coder pack for TI c2000 processor, but while configuring it is asking the toolchain of CCS.
I have CCS of version 10.4.0, but in the drop down option list option showing with version upto 6, and then when I select the CCS v6 and try to validate it, it is showing error message like readme text file not found.

is it required to download lower version of CCS to complete this setup? c2000, ccs, embedded coder, code composer studio, code generation MATLAB Answers — New Questions

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already tested a lot of codes and found nothingalready tested a lot of codes and found nothing already tested a lot of codes and found nothing gui MATLAB Answers — New Questions

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