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Walter Roberson


Last seen: Today Active since 2011

I do not do free private consulting. If you want to bring my attention to something, send a link to the MATLAB Answers location. I am currently caught up to T0099119; if you are waiting on a reply from me for an older issue, please send me a reminder.

Programming Languages:
C, MATLAB, Shell, Perl, Fortran
Spoken Languages:
English

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Answered
What CNN algorithms can I use for Denoise Speech?
Data is data. You can reshape it or chop it up however you want. Deep Learning algorithms do not care whether the data was an im...

1 hour ago | 0

Answered
surf can not be drawn/how triple objective function is written in same page with ga solver?
Your question is not clear. nvars = 2; lb = [-3 -3]; ub = [3 3]; %initial population %crossover and mutation options = o...

7 hours ago | 0

Answered
Help iteration for loop and tables vertcat
Don't do this. put the tables in a cell array and use cell indexing instead of dynamic variable names.

10 hours ago | 0

Answered
Why do I receive an error in image write in the imwrite saying I cannot write jpeg file because of signed integer, appreciate it a lot, thanks.
https://petapixel.com/2014/01/22/jpeg-standard-gets-boost-will-support-12-bit-color-depth-lossless-compression/ The maximum b...

10 hours ago | 0

Answered
ode45,ODE23 , force is not a time dependent function
If you have external impulses, then none of the ode* functions can be used for the entire timespan, *unless* the forces can be i...

13 hours ago | 0

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Answered
How to include a Latex package for MATLAB Latex Interpreter to use?
There is no known way to do this for the last several years, with the exception that it is potentially possible for Report Gener...

13 hours ago | 0

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Answered
from File and if block conditions error
Transpose your mat data. Timestamps are first *row* not first column.

13 hours ago | 0

Answered
Converting string to function/number
str2sym() matlabFunction is commonly used together with str2sym()

13 hours ago | 0

Answered
I want to build simple multiply function with GUI, but every time a got an error with it, with pushbottom
rename product_Callback to Pushbutton1_Callback And next time use the facilities of Guide to rename controls so that it will ...

14 hours ago | 0

Answered
Computational Time Analysis in Simulink
There is no meaningful solution for continuous time models. Continuous time models use ode solvers that can reject steps in orde...

14 hours ago | 0

Answered
Interactive rectangle on UIAxes for user to choose a region
https://www.mathworks.com/help/images/ref/drawrectangle.html and make sure to pass in the uiaxes

15 hours ago | 0

Answered
Can you use multiple TCP/IP links in parallel on one device?
Do not kill the command prompt from within the worker, you are killing the ones created by the other workers. You should cons...

15 hours ago | 0

Answered
How can I separate the elements of a vector ?
File Exchange, run length encoding. If I recall correctly, contribution is from Jan.

16 hours ago | 0

Answered
I want it to find the solution with the Newton Raphson method with the function entered, but it gives an error and when I copy and paste the codes on another page, it pastes d
fstr = input('Fonksiyon değerini giriniz f(x):', 's'); syms x fsym = str2sym(fstr); f = matlabFunction(fsym, 'vars', ...

16 hours ago | 1

Answered
BUG: Saving plot into png changes the fontsize
Switch to https://www.mathworks.com/help/matlab/ref/exportgraphics.html

17 hours ago | 0

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Answered
Difference between debug parfor loop and run it
parfor is not always able to automatically determine which functions will be called by workers, especially if eval() or run() is...

18 hours ago | 0

Answered
Getting "Unrecognized function or variable 'reshape'" error!!
reshape([1 2 3 4],:,1); Notice the : . : by itself can only appear (a) in comments; (b) in character vectors; (c) in string...

18 hours ago | 1

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Answered
Unsure why heatmaps cannot be produced.
imgetfile() is part of the Image Processing Toolbox. The code would fail if you do not have that toolbox installed and licensed....

18 hours ago | 0

Answered
How can I solve dimension problem? Simulink
You need to transpose the data in the file. The first row is the time stamps and rows after that are samples for that time. You ...

22 hours ago | 0

Answered
How can I plot this picture!!!?
plot([x, x, repmat([x-delta,x+delta,nan],1,9)], [0, 1,.1,.1,nan,.2,.2,nan,.3,.3,nan,.4,.4,nan,.5,.5,nan,.6,.6,nan,.7,.7,nan,.8,...

22 hours ago | 0

Answered
the funcion of "load" might have mistakes while loading the hexadecmial number. The hexadecimal numbers start with "0x".
https://www.mathworks.com/help/matlab/ref/load.html#btm0etn-1-filename ASCII files must contain a rectangular table of number...

23 hours ago | 0

Answered
Unable to perform assignment because brace indexing is not supported for variables of this type.
data{iBlob, 1} = features.Centroid(2); data{iBlob, 2} = features.Centroid(1); data{iBlob, 3} = iBlob; data{iB...

23 hours ago | 0

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Answered
Is exp() a Documented Function in the Symbolic Math Toolbox?
There is no doc for it. help sym/exp gives very brief help (nearly useless)

23 hours ago | 0

Answered
where are the errors in my code? please help me!!
Your first solve() returns multiple roots. Your vpasolve() is then trying to process all of the roots at the same time . Remem...

1 day ago | 0

Answered
looping through multiple numbers
a_t(i) = A(A(:,2) > avsize(i),:);

1 day ago | 0

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Answered
collect coefficient of a symbolic variable in mathematical expression
Use coeffs() syms T m_q m_p x(t) z(t) x_dot(t) x_ddot(t) z_dot(t) alpha(t) z_ddot(t) alpha_dot(t) alpha_ddot(t) theta(t) theta...

1 day ago | 0

Answered
Why legend doesn't match plot
allOri = unique(ori); The size of that is not known ahead of time. You construct hPlot(li) elements over two separate loops th...

1 day ago | 0

Answered
How to determine coefficients by fit for multiple series of data?
x = [2,4,6,NaN,NaN; 2,4,6,8,10; 2,4,6,8,NaN]; y = [3,5,7,NaN,NaN; 4,8,11,25,32; 7,10,15,17,NaN]; D = [3;5;7]; N = size(x, 1);...

1 day ago | 0

Answered
Colour code to find how big a function is
f = (y-x)./(1+x.^2); then https://www.mathworks.com/matlabcentral/fileexchange/39972-colormapline-color-changing-2d-or-3d-lin...

1 day ago | 0

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Answered
Error using trapz (line 47) Dimension argument must be a positive integer scalar within indexing range.
syms x; Symbolic drivative = diff(A(i,1)*x^2+A(i,2)*x+A(i,3)); Symbolic because x is symbolic. Ty = sqrt(1+(drivative^2)); ...

1 day ago | 0

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