Walter Roberson
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.
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Top ten contributors whose answers received the most acceptances in 2021
Awarded to Walter Roberson on 01 Jan 2022
Reach 100000 reputation points. Honors the first contributor to reach this milestone, Walter Roberson
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Solve a problem for the first time
Awarded to Walter Roberson on 10 Jun 2017
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The contributor whose answers received the most acceptances in 2019
Awarded to Walter Roberson on 01 Jan 2020
The contributor whose answers received the most acceptances in 2018
Awarded to Walter Roberson on 18 Jan 2019
The contributor whose answers received the most acceptances in 2017
Awarded to Walter Roberson on 02 Jan 2018
Contribute at least one answer each month for 36 consecutive months
Awarded to Walter Roberson on 20 Jul 2017
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Content Feed
灰色图像颜色恢复后图像subtraction
mask = repmat(all(Subtracted == 0, 3), 1, 1, 3); Subtracted(mask) = Original(mask);
11 hours ago | 0
Concatenate together two cell arrays
BB = cellfun(@(c,d) [c;d], CC, DD, 'uniform', 0);
14 hours ago | 1
|accepted
I tried to solve 6 couple differential equation, and getting an error which is " Index exceeds the number of array elements. Index must not exceed 2."
x = tspan(1):h:tspan(6); That line is expecting that tspan is a vector or array with at least 6 elements Working backwards f...
15 hours ago | 0
|accepted
Why do I recieve an error when trying to change the Line Width of a plot line?
//www.tianjin-qmedu.com/help/curvefit/cfit.plot.html#namevaluepairarguments plot() of cfit or sfit objects is not the regula...
1 day ago | 0
Error using integer wavelet transform
[cA, cH, cV, cD] = lwt2(double(data), 'LiftingScheme', liftscheme);
2 days ago | 0
How to check the function call stack during the debugging process
What you might be running into is that callback functions are considered to not have a calling function. Each callback is execut...
2 days ago | 0
how to padding array with zeros to limit rows (I can choose the limit)
[AB; zeros(21-size(AB, 1),size(AB, 2))]
3 days ago | 0
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How do you remove x-axis tick marks and keep the numbers?
plot(rand(1,20)) ax = gca; ax.XAxis.TickLength = [0 0.1];
3 days ago | 0
How to write code for solving system of nonlinear inequality
x=-10:1:10; for i=1:length(x) if x(i)>=0 y(i)=6*x(i)^2-5*x(i)+14; elseif x(i)>10 disp('x out of ran...
3 days ago | 0
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How do I find the index of the first element equal to 0 for each row of a matrix in a fast way
You cannot do it with a single find() A vectorized way to do it is M = ones(5,10); M(randperm(50,10)) = 0; M idx = sum(cum...
3 days ago | 0
Using a for- loop to extract a range of columns every n-columns
data = rand(64,10000); startcols = 1:2000:size(data,2)-1999; for w = 1:length(startcols) sc = startcols(w); extrac...
3 days ago | 0
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What is a comparison of m file and livescript file?
Livescript can insert text and equations as narration Livescript inserts plots "in-line" or to the right hand side, instead of ...
4 days ago | 0
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Is there a way to modify the path for ".." ( shortcut ) ?
You can change the startup folder; see //www.tianjin-qmedu.com/help/matlab/matlab_env/matlab-startup-folder.html The effect ...
4 days ago | 0
How add my folder '+op' to the path Matlab?
You can never add a + folder to the MATLAB path. Instead, you add the folder containing the + folder.
4 days ago | 0
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Spit an array when the value 0 occurs until the value 2
Your request is a bit ambiguous, so I will give two possibilities. loc0 = find(YourArray == 0, 'first'); %use this loc2F = ...
4 days ago | 1
How to save an app property to an .m file?
When you save() with -struct then the name that you give must be the name of a full variable. That is, copy app.dataPaths to a ...
4 days ago | 0
|accepted
run matlab help function_name from terminal
matlab -nodisplay -nodesktop -r "help function_name"
4 days ago | 0
How do i get multiple values all at once from cell array?
Your options: loop cellfun arrayfun (effectively the same as cellfun) cell2mat to form a 3d array, and then index; this is v...
4 days ago | 0
能不能把下面储存在元胞里面的t(i)换成具体的值，是不是有强制计算什么的
t=[1 2 3 4 5] for i=1:4 cmd = sprintf('@(a)%.16g.^a-%.16g.^a', t(i+1), t(i)); F{i} = str2func(cmd); end F
4 days ago | 0
|accepted
FAQ: Why is 0.3 - 0.2 - 0.1 not equal to zero?
Consider any finite-length positional notation with a fixed base, B. For example, base 10 and 0.193 meaning 1 * 10^-1 + 9 * 10^-...
4 days ago | 1
why 350*0.001 - 0.350 and 351*0.001 - 0.351 are different from zero
Consider any finite-length positional notation with a fixed base, B. For example, base 10 and 0.193 meaning 1 * 10^-1 + 9 * 10^-...
4 days ago | 1
Undefined function 'adaptcluster_kmeans' for input arguments of type 'uint8
That function is not part of MATLAB. You need to install //www.tianjin-qmedu.com/matlabcentral/fileexchange/45057-adaptive-kme...
4 days ago | 0
How to reshape any matrix using while loop or any other method?
A = B(:, 1:6:end) ;
4 days ago | 0
How to free memory from C-code in simulink embedded matlab code block
StopFcn will not have access to the persistent variables. Use global and a datastore
4 days ago | 0
Can Matlab record an audio with a sampling frequency of 800 hz
audiorecorder cannot be used for this purpose. Although the frequency range supported is operating system and hardware specific,...
5 days ago | 0
Do you edit code on Github?
The code you upload to Github should be tested code (with the possible exception of Github collaboration mode)
5 days ago | 0
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Minimisation of a scaler function
The function is ST(fSL .* (exp(scale .* SC))) with varying values of "scale". You did not happen to show the definition of ST ...
5 days ago | 0
Good day, Please I tried searching for drive cycle on my Simulink but I didn't find it.
//www.tianjin-qmedu.com/help/autoblks/ug/install-drive-cycle-data.html You need Powertrain Blockset
5 days ago | 1
|accepted
How to do +,-,*,/ with one scalar and one matrix(IN GUI)?
str2double always returns a scalar when the input is a character vector or character array. It only returns a matrix if the inpu...
5 days ago | 1
How to make xtick where there is a tick label in bold?
xticklabels({'','','\bf 1980','','','','','\bf 1985',... '','','','','\bf 1990','','','','','\bf 1995','','','','','\bf 2...
5 days ago | 0
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