Walter Roberson
Followers: 46
I am currently in the middle of moving, so I am not around very much.
C, MATLAB, Shell, Perl, Fortran
Spoken Languages:
English
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Top ten contributors whose answers received the most acceptances in 2023
Awarded to Walter Roberson on 01 Jan 2024
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Awarded to Walter Roberson on 01 Jan 2023
Solve a problem for the first time
Awarded to Walter Roberson on 10 Jun 2017
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Top ten contributors whose answers received the most acceptances in 2021
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Reach 100000 reputation points. Honors the first contributor to reach this milestone, Walter Roberson
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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
The contributor whose answers received the most acceptances in 2016
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Feeds
How does MATLAB app designer call external. m functions after packaging into exe?
When you package into exe then external .m that are not packaged as part of the exe, cause an error when they are called. Onl...
ungefär 10 timmar ago | 0
extract max and min frequency of a spectrum
You could fft(), and take the first half of the results, and find the last bin such that abs(BIN)>0 . That last bin will corresp...
ungefär 18 timmar ago | 0
Passing output from afterEach to variable
This method is fairly clumsy, but in theory it would work. Use a parpool size of 1. Use parfeval() to create a parallel.pool.P...
ungefär 19 timmar ago | 1
| accepted
how to find the function "helper plot fluctuation loss" to plot this image in matlab help?
When you openExample('radar/IntegrationAndFluctuationLossesExample') it will set up a directory for you and cd to that direct...
ungefär 19 timmar ago | 0
| accepted
Taylor's theorem, find approximation for e^-x for x =1 with accuracy of 5 decimals.
Taylor's series involves accumulating the sum of terms. The sum of the n'th derivative of the function divided by n factorial ti...
ungefär 19 timmar ago | 0
i want to plot fragility curve stress vrs probability of failure and mean speed vrs probability of failure no of data is 48500
Your failure probability is a scalar. mean speed could be calculated as mean(data.Speed_km_h) but that would be a scalar. Plotti...
en dag ago | 0
Same script in a path folder and the current folder. Which takes priority? (2024a, Ubuntu)
According to https://www.mathworks.com/help/matlab/matlab_prog/function-precedence-order.html 3. Nested functions within the c...
en dag ago | 0
Simplifying symbolic expression to get real of real function in it.
syms x (x^3 + x)/x^2 + 5 real(ans) You can see that if you have a real() call then the Symbolic Toolbox already automatically...
2 dagar ago | 0
Data not being written in file
Did you remember to fclose() the file?
2 dagar ago | 0
| accepted
How to access the certain data Simulink model ?
You can use a Selector block to extract particular columns from simulink signals. https://www.mathworks.com/help/simulink/slref/...
3 dagar ago | 0
How to Solve a System of Equations for symfun Objects?
Is there a way to define all of the R(s),E(s),G(s),Y(s) as symfun from the start and simultaneously solve eq1 and eq2 directly f...
3 dagar ago | 0
| accepted
How to continuously create an array of the latest values of a signal in SIMULINK?
You can use a buffer block https://www.mathworks.com/help/dsp/ref/buffer.html (requires the DSP System Toolbox)
3 dagar ago | 0
transform table variable into struct variable.
Perhaps use table2struct ? Note that your posted code creates a cell array, U and uses () indexing to try to set U(1) and so on...
4 dagar ago | 0
| accepted
How to merge data in mat file?
load pot1 newpot = pot(~arrayfun(@(S)isempty(S.tr), pot)); save('newpot.mat', 'newpot')
4 dagar ago | 0
Can we download Predictive maintenance toolbox for free, and is it compatible with MATLAB 2017a?
The Predictive Maintenance Toolbox was introduced in R2018a, so it is not compatible with R2017a. It cannot be downloaded for f...
4 dagar ago | 0
How can show 2D plot of 3 file data analysis and show effect of change ?
S = fileread('ST1.txt'); S = regexprep(S, '\*I', ''); S(1:100) ST1data = cell2mat(textscan(S, '%f %f %f%f')); ST1 = reshap...
5 dagar ago | 0
How to remove extraneous Matlab-generated vertical lines that connect function values at jump discontinuities?
MATLAB does not do that. What is happening is that when you use plot() on a finite set of data, then where there are places tha...
5 dagar ago | 1
| accepted
how to crop a binary mask to remove all black pixels while maintaining the largest area of white pixels?
vertproj = any(YourMask,1); horzproj = any(YourMask,2); minx = find(vertproj,1,'first'); maxx = find(vertproj,1,'last'); min...
5 dagar ago | 0
Simulink Mathlab Function Block Output Variable Size Array
Insert totalValue = uint8(0); before totalValue = (y3+2);
5 dagar ago | 0
minimizing with genetic algorithm
y = @(x) (1.002)-((1-exp(-0.00003*x))./(0.00003*(x+1.5)+(0.00063*(1-exp(-0.00003*x))))); fplot(y, [-2, 10]) fplot(y, [-1.5 -...
5 dagar ago | 0
Can I plot two figures simultaneously but with less data for the second figure?
Well, you can... but it isn't worth the trouble. N1 = 1001; N2 = 20; theta = linspace(0, 2*pi, N1); [~, pi_idx] = min(abs(th...
6 dagar ago | 0
| accepted
chiral medium in matlab
The internal code looks like if ~isDielectricSubstrate(obj) feed_x = obj.DefaultFeedLocation(1)+ ...
6 dagar ago | 0
| accepted
Install MIDAS Toolbox in Matlab 2024b
Most items installed by the Add-On Explorer do not show up in ver (official MATLAB toolboxes being the exception -- but Support ...
7 dagar ago | 0
| accepted
Reading Arduino Serial Port into Matlab and 50% of the time getting characters instead of digits.
It is not documented what the return value is if the reading fails, such as if there happens to be non-numeric bytes in the inpu...
7 dagar ago | 0
Will leftover CPU cores (not used by parfor workers) be used for built-in multithreading?
No, left-over cores will not be automatically used. They will be left for the operating system to run (whatever) on. If you wan...
7 dagar ago | 0
| accepted
Limitations of MATLAB Compiler SDK Free Trial?
Free trials of MATLAB Compiler SDK are 30 days. However, MATLAB Compiler SDK is not available under a Student license. If I re...
7 dagar ago | 0
Import data to app during simulation
To Workspace only updates when the simulation pauses or stops. There are no blocks that will update variables in the workspac...
8 dagar ago | 0
| accepted
How to solve nonlinear equation system with variable inputs?
syms Eta0 i0 syms w [1 3] syms T [1 3] eqn1 = T(2)/T(1) == i0 * power(Eta0, T(1) * (w(1)-w(3))/abs(T(1) * (w(1)-w(3)))); pret...
9 dagar ago | 0
too many outputs for ginput - documentation error?
You are not missing anything. The behaviour of returning both X and Y together in one output is undocumented . (It might perha...
9 dagar ago | 0
| accepted
Daily mean through long time
build a timetable() from the data. Use retime()
9 dagar ago | 0
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