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.

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Function that creates figures only?
No, it is not possible in MATLAB to create a function that *only* produces plots without doing *anything* else. In the case w...

9 hours ago | 0

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Imread error in Raspberry pi deployment
Two cases: If the file is a static file available to the matlab host, with constant name, then read the image and save it to ...

10 hours ago | 0

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Can someone explain why I am getting the error "Not enough input arguments (line 4)"?
You tried to run the function without passing any matrix to it, and matlab complained that it could not find any input being pas...

12 hours ago | 0

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There is an error in line 3. I can't figure out what the error is. Please help me find out.
You tried to run the function without passing any matrix to it, and matlab complained that it could not find any input being pas...

12 hours ago | 0

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Matlab integral funtion error
f=@(x)(x.*exp((x.^2)-1))./sin(x)

12 hours ago | 1

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How to elegantly open or create new file for reading and writing but not discard existing contents?
fopen with 'a' and close immediately. Then fopen 'r+' This does rely on no process deleting the file between the time it is ...

12 hours ago | 0

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How to define an objective function that maximize one thing and minimize the other at the same time?
Any matrix that does not have full rank will have a determinant of 0. If there is a k in range that makes X have rank less than ...

13 hours ago | 1

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Answered
converting index to coordinates(row,col) is giving me error
[row,col]=ind2sub(sz,12744)

13 hours ago | 1

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Answered
How to maximize determinant of a matrix?
CostFunction = @(x) -det(x); % Cost Function

14 hours ago | 1

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Answered
how to use .mex file in simulation for quanser qube servo?
There is no possibility that will work. MEX files require a full MATLAB runtime, either as an actual MATLAB or as the MCR (MATLA...

14 hours ago | 0

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random select n elements from n arrays
Lists = arrayfun(@(idx) randi(99,1,100), 1:50, 'uniform', 0); one_random_selection = cellfun(@(L) L(randi(100)), Lists) sort...

15 hours ago | 0

Answered
Write image info using imwrite or other method
You cannot do that using imwrite(). Most of what you want to write is EXIF information. MATLAB does not support writing EXIF i...

15 hours ago | 1

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Answered
How to store nonlcon value at solution using fmincon?
fmincon() is permitted to evaluate at locations without passing that exact location through the nonlinear constraints before or ...

17 hours ago | 0

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Tips for organizing variables in the workspace? Is there an option like "exlude capitalized variables" like python/spyder?
The below code, when executed, creates a list of links, one for each lower-case variable name. When clicked, the variable will b...

18 hours ago | 1

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Is it possible to write an 'empty' cell in Matlab, not NaN?
In the below code, I examine the first numeric line, and I assume that if the second element is nan, that the first element is i...

19 hours ago | 0

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Answered
integrating a function using int
Use the techniques I show at https://www.mathworks.com/matlabcentral/answers/890822-how-can-i-integrate-a-function-which-has-thr...

1 day ago | 0

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how to convert analog signal to bit stream
That is not an analog signal. An analog signal is created by outputing to a hardware device. What you have is a digital signal. ...

1 day ago | 0

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Save results data to a new table each loop iteration
All_T_Departures = cell(s, 1); for i = 1 : s stuff All_T_Departures{i} = T_Departures; end If you want, at this poi...

1 day ago | 0

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Answered
Geoscatter plot with different colors
dot_color = repmat([1 0 0], length(Lock), 1); dot_color(Lock == 3, :) = [0 0 1]; lat = y; long = x; pointsize = 20; scatterm...

1 day ago | 0

Answered
Split column in table based on character
S = "51∞ 13' 51,6""" str2double(regexp(regexprep(S, ',', '.'),'[\d.]+', 'match')) Is it possible for + or - to appear? How is ...

1 day ago | 0

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Answered
Data dimensions must agree error
x and y coordinates for surf() must be either vectors or 2 dimensional, never 3 dimensional. If you have 3 independent variable...

1 day ago | 0

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how can i integrate a function which has three variables but has to integrate it with respect to only one variable
You do not seem to be able to find a closed form solution with symbolic d or e. Your ilaplace() involves the sum of an expressi...

1 day ago | 0

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How to replace spaces with underscores in all variable names of a table?
X.Properties.VariableNames = regexprep(X.Properties.VariableNames, ' ', '_'))

1 day ago | 1

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My function creates a high oscillating unusual plot
The summary of the below investigation is that what you are observing appears to be a bug or limitation in MATLAB. It might be ...

1 day ago | 0

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how do i write this in matlab?
x = sym("x" +(0:10)); syms X E = subs(euler(0:10,X),X,x(:));

1 day ago | 0

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If I buy Matlab and Simulink Student Suite can I instal MatlabBGL library?
MatlabGBL appears to be a (free) File Exchange contribution. I am not aware of any reason that it could not be used by a Student...

2 days ago | 0

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Is there anyway to Re-grid one dataset to another dataset resolution without interpolating??
origLon=-178.5:3:178.5; origLat=-89:2:89; norlon = length(origLon); norlat = length(origLat); A = rand(norlon,norlat); newLon...

2 days ago | 0

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Answered
Fsolve says 'equation solved at initial point' -- how to fix?
Your xout only involves 544 of the 562 variables. To establish this, change xss = cell2mat(xss); to xss = horzcat(xss{:}); ...

2 days ago | 0

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convert from Matlab to equation (formula)
syms Y3 [1 5] syms GOD [1 5] for j=1:numel(Y3) if j==1 GOD(j)=Y3(j); else ...

2 days ago | 0

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can we use particleswarm for matrices?
No. Each array element output would be an "objective", but particleswarm() is strictly single objective. You would have to retu...

2 days ago | 0

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