Walter Roberson
Followers: 57
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
Top ten contributors whose answers received the most acceptances in 2023
Awarded to Walter Roberson on 01 Jan 2024
Solve a problem for the first time
Awarded to Walter Roberson on 10 Jun 2017
Publish your first review
Awarded to Walter Roberson on 09 Oct 2019
Top ten contributors whose answers received the most acceptances in 2022
Awarded to Walter Roberson on 01 Jan 2023
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
Awarded to Walter Roberson on 14 Aug 2020
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
Awarded to Walter Roberson on 20 Jul 2017
Feeds
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 -...
ongeveer 16 uur 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 ...
ongeveer 18 uur 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...
ongeveer 20 uur 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...
ongeveer 21 uur 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...
1 dag 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...
1 dag 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...
1 dag 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...
1 dag 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...
2 dagen 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...
3 dagen ago | 0
Help. Cannot get tables to work.
Most likely you have a third-party height.m function. Use which -all height to check
3 dagen 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...
3 dagen 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...
3 dagen 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,...
4 dagen ago | 0
uicontrol not working inside a function
uicontrol('Style', 'pushbutton', 'String', 'Chiudi', ... 'Position', [20 20 50 20], ... 'Callback', 'isAnimating=false...
4 dagen 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...
4 dagen 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)
4 dagen ago | 0
How to extract a string from a list and use it with dot notation
stringListUpper = ["ABC","DEF","GHI"]; stringListLower = ["abc","def","ghi"]; for i = 1:3 for j = 1:3 AssignTo(s...
5 dagen ago | 0
Ability to timestamp vicon nexus for reaction time
For work of this kind, we recommend Psychtoolbox http://psychtoolbox.org/ which has extensive MATLAB compatibility, and is desig...
5 dagen ago | 0
"isfield" for hidden field in optimoptions
optimoptions returns on object of class optim.options.Fsolve not a struct. You need to use isprop(options,'JacobPattern') How...
5 dagen ago | 0
Plotting second derivatives of magnetic fields.generated by Helmholtz Coils
n = sqrt(v(1^2+v(2)^2+v(3)^2)); should be n = sqrt(v(1)^2+v(2)^2+v(3)^2);
5 dagen ago | 0
Numerical integration methods for surface integral
Your integral is with respect to S. Nothing being integrated depends on S. Therefore the integral is constant times the differ...
5 dagen ago | 0
How many c0mputer I can istall and activate Matlab and how many run Matlab at same time
To do that, you would need one of: Concurrent license sized for 2 concurrent licenses Standard/Commecial/Professional individu...
5 dagen ago | 0
Having a .mat file store an image to call to a tab in app designer
new_image_variable = 'Schematic'; % Save the updated data to the .mat file save('name.mat', 'new_image_variable', '-append');...
5 dagen ago | 0
How do I process and display a 10 and 12 bit image in matlab?
There are three primary ways of storing 12 bit images: as plain uint16() integer values in the range 0 to 4095. The "left" 4 b...
5 dagen ago | 0
| accepted
Generate C code from matlab code issue
Code cannot be generated for uigetdir because the C standard library does not define any directory operations. Directory ope...
5 dagen ago | 0
Getting relative time from two events identified as absolute time
elapsed_as_duration = datetime(E5) - datetime(E0); Now you can ask things such as seconds(elasped_as_duration)
6 dagen ago | 0
| accepted
Check if the value for a field in a struct exists
A=struct('a', {}) isempty(A) isempty(A) || isempty(A.a)
6 dagen ago | 0
| accepted
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