Walter Roberson
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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 2024
Awarded to Walter Roberson on 02 Jan 2025
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Solve a problem for the first time
Awarded to Walter Roberson on 10 Jun 2017
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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
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The contributor whose answers received the most acceptances in 2018
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The contributor whose answers received the most acceptances in 2017
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Contribute at least one answer each month for 36 consecutive months
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The contributor whose answers received the most acceptances in 2016
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Feeds
Plotting around zero deg. Angle
When you specify a vector for x for imagesc, MATLAB ignores everything except for the first and last entries. It does not care t...
6 hours ago | 0
How to stop while loop with the Command Window ?
Your existing code never reads from the keyboard, so the keyboard is effectively locked out during execution (well, not locked o...
9 hours ago | 0
ode45 code for 2 body problem
Use axis equal Your x axis range is different from your y axis range, so you are seeing a distorted view.
9 hours ago | 0
Plotting the graph of only the last iteration
syms T U for n=1:10 y=int(H(U),0,T); yy= r0 + ((1-a)./M)*H(t).*r1 + (a./M)*y; r1=yy; end The output in y is symbolic -- ne...
9 hours ago | 0
| accepted
how to send parameter function between app
Methods are also passed the object they relate to, unless they are marked as being "static"
10 hours ago | 0
How to get consistant results when testing code performance
You could potentially code MATLAB-level sim() calls, inside a timeit However according to https://steveeddins.com/story-of-tim...
10 hours ago | 0
How to learn System Composer
There is a free System Composer Onramp course; https://matlabacademy.mathworks.com/details/system-composer-onramp/orsc
23 hours ago | 0
I have some questions about the example "Denoise Signals with Generative Adversarial Networks"
When you openExample('deeplearning_shared/DeepSignalDenoiserExample') then the directory that you are automatically cd()'d to ...
23 hours ago | 0
| accepted
My code answers empty sym 0 by 1, except when the symbol equals zero.
syms x y1=solve(x,1) That means to solve the system of simultaneous equations x == 0 1 == 0 As it is impossible for 1 to eq...
24 hours ago | 0
How to code an equation with that integrates a vector.
There are two ways. You can do it symbolically: syms A B C syms u__vec_(t) [1 5] x_0__vec = [A*cos(B)*cos(C) 5 ...
1 day ago | 0
MATLAB Optional Function Arguments
Suppose you have a function call that you intend to be passing in thesholdGain, and skip omega and transition. So you call best...
1 day ago | 0
Function With varargin Argument That Can Be Compiled With codegen
C has no native way of expressing optional arguments. The convention that has grown up in C is to arrange all of the optional pa...
1 day ago | 0
Image Classification using Percentage
classNames = categories(imdsTrain.Labels); That tells us that the class names are categoricals. It is doubtful that the class n...
1 day ago | 0
How to remove columns in very large matrices.
Working by selecting columns to save is marginally slower than working with columns to delete, on average. The timing overlaps -...
2 days ago | 0
Solving matrix differential equation
You try to take the derivative of x1 with respect to x2. You cannot meaningfully take the derivative of a function with respect ...
2 days ago | 0
| accepted
Missing input in the argument
K=@(t,p,Z,d,r1) (p*Z-d-exp(-t))*r1; K is defined needing 5 input parameters. V(i) = r0 + ((1-a)./M)*integral(K,0,P(i))+ (a./M...
2 days ago | 0
| accepted
using sparse matrix and vpa function simultaneously
Sparse matrices are implemented for double precision, and for logical. As of R2025a Pre-Release they are also implemented for si...
2 days ago | 0
Issue while using bostemp
There are two possibilities here: You might not have The Signal Processing Toolbox installed You might have MATLAB configured...
3 days ago | 0
Why am I receiving syntax errors for a file that I know can compile fine?
You could try using typedef struct SOMENAMEGOESHERE { ... } FUNCTION_1_REQUEST_T; instead of typedef struct { ... } FUNCT...
3 days ago | 0
How Can a sym Vector have Elements that are Vectors Themselves?
I think it is a bug that simplify() returns this form. I suspect that the result of the simplify() is a piecewise() constructi...
3 days ago | 0
simulink real to IQ
Simulink does not have an IQ datatype, so it is difficult to know what you are asking for. Simulink has a real + imaginary to c...
3 days ago | 0
I am working on an assignment for class I can't figure out how to round the values in the table to two decimal places. Can anyone point out what I am missing?
Use format bank before displaying the table. All of the values in the table happen to have only a single decimal place of pre...
3 days ago | 0
NI USB-6451 not supported in Data Acquisition Toolbox
The USB-6451 is not listed as supported on https://www.mathworks.com/hardware-support/nidaqmx.html It is hypothetically possib...
4 days ago | 0
Help. Cannot get tables to work.
Most likely you have a third-party height.m function. Use which -all height to check
4 days ago | 0
| accepted
Vectorizing to speed up integration
You can improve speed a little by using temp = int(int(dK,u,0,u,hold=true),v,0,v,hold=true) dk = release(temp); However, usin...
4 days ago | 1
| accepted
Deleting stored intermediate values in ODE15s
LastN = 500; options = odeset('JPattern', j, RelTol=1e-7,AbsTol=1e-7); out = ode15s(@(t,C)PDEs(input,t,C), [0, 60*(input.SimTi...
4 days ago | 0
Adding vectors of different sizes... works now? Can this be suppressed?
There is no way to suppress implicit expansion. Consider by the way that 3 + eye(4) also breaks the rules of matrix addition,...
5 days ago | 0
uicontrol not working inside a function
uicontrol('Style', 'pushbutton', 'String', 'Chiudi', ... 'Position', [20 20 50 20], ... 'Callback', 'isAnimating=false...
5 days ago | 0
simulink is not working license checkout failed warning is shown
There are a few possibilities here: If you have an individual license, it is possible that you somehow installed Simulink but y...
6 days ago | 0
how to input a function as a parameter of a function
Use @fun as the parameter. For example X0 = fMin1D(.5, 17, 32, 1e-10, 0.8, @fun)
6 days ago | 0
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