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Walter Roberson


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48,163 total contributions 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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Answered
Numbers in command window printed 10000 times smaller
My recommendation would be that you go into Preferences -> Command Window -> Text Display, and choose numeric display "long g",...

3 hours ago | 0

Answered
more then one tag on object in figure
No. The Tag field of an object must be a character vector or a scalar string. The only way to store multiple tags would be to en...

4 hours ago | 0

Answered
How to check whether the function invertible or not?
If all you are given is a function handle, and you are not permitted to examine the source code, then it is not always possible ...

4 hours ago | 0

Answered
Execution time of functions used in anonymous function creation
What is the best way to force immediate execution of a function that is being used as part of an anoymous function? stackAnalye...

4 hours ago | 0

Answered
What is wrong with my Gompertz Equation?
V=p(1)*(p(2)/p(1)).^exp(-p(3)*t); Notice the .^ instead of ^ . Your t is a vector, and the ^ operator is the matrix power oper...

5 hours ago | 0

Answered
Error using mex Unknown file extension ' '. Matlab Ubuntu
mex does not accept directory names as individual arguments: it thinks you are specifying files to be compiled and then complain...

5 hours ago | 0

Answered
Resize the images without deforming them
Resizing images always introduces distortions. In some cases the distortions are acceptable. In other cases, the distortions ar...

5 hours ago | 1

Answered
Is there any ways to find all elements' rows and cols number at once?
[~, column_numbers] = find(Array) [~, column_numbers] = find(Array == value) %or any relationship Note: in the specific case...

6 hours ago | 0

Answered
Input's control to check if is a function
First you should test isa(f, 'function_handle') That will eliminate everything except function handles. To specifically narro...

8 hours ago | 0

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Answered
Can not get exact exppresion due to cos function using Matlab symbolic toolbox
Irrelevant. cos(-x) = cos(x) so cos(a*f(x)) = cos(a*(-f(x)))

8 hours ago | 0

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Answered
Display Numbers in UITABLE
If you are using uitable with "traditional" figures, figure(), then set the ColumnFormat property to {'shortg', 'shortg'} https...

8 hours ago | 0

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Answered
Hi, I have written a code using the pdepe solver, but i get nothing when i run. Only my variables show in the workspace. Any help please
Correct. Your code clears variables and clears the screen. Then it defines 6 variables. Then it defines several functions. ...

9 hours ago | 0

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Answered
How to Get a script to end if a certain input is entered
if hms1 == 0 || hms2 == 0 flag = false; else intervalAddition(hms1, hms2); disp(hms1); disp(hms...

9 hours ago | 0

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Answered
Which function can I use instead of fsolve to solve a system of nonlinear equations with a global optimisation?
First of all, mathematical theory tells us that there exist functions where knowing the value of the function at one location gi...

10 hours ago | 0

Answered
Interpolation of scattered earthquake data
[xi,yi] = meshgrid(119:1:120, -3.2:1:-2.2); >> [min(x),max(x),min(y),max(y)] ans = 119.18147 119.609587 -3.132489 -2.3924...

11 hours ago | 0

Answered
Read file with non-uniform lines?
Named tokens, I said. Do not extract the lines ahead of time. FileText = fileread(YourFileName); Ctokens = regexp(FileText, ...

11 hours ago | 0

Answered
Error: Unable to perform assignment because the left and right sides have a different number of elements.
Okay, so your problem is that your x is not the orientation you expect. When you index a vector of values at a vector of indic...

11 hours ago | 0

Answered
Expansion in a Fourier Series
cos(n*pi)=(-1)^n that is an assignment statement. n is a symbolic variable. The only time that can have NAME(SYMBOLIC_EXPRE...

14 hours ago | 0

Answered
how to write in matlab (x = 0<=x<=pi/8
syms x assume(0<=x & x<= sym(pi)/8) maybe. Or perhaps x=0; x<=x<=pi/8 which is pretty unlikely to be useful i...

16 hours ago | 0

Answered
Getting a "When simulating the response to a specific input signal, the input data U must be a matrix with as many rows as samples in the time vector T, and as many columns as input channels" error
t = 0:0.05:10; That has 201 entries. When you pass that vector of 201 entries into the time slot of lsim() then your state tabl...

21 hours ago | 0

Answered
How can I format cell inputs when using writematrix?
writematrix() cannot do any formatting; neither can writecell() or writetable(). To do formatting in .xls and .xlsx you need to...

21 hours ago | 0

Answered
In Simulink, is it possible to send data to workspace in real-time using the 'ToWorkspace' block?
Use a data store. https://www.mathworks.com/help/simulink/ug/model-global-data-using-data-stores.html

21 hours ago | 0

Answered
tabulate cell2table
Your C variable in your table is probably already stored the way you want. It is the variable browser that is displaying separat...

21 hours ago | 0

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Answered
issue with integral3
integral2 and integral3 *always* pass in vectors or matrices to be evaluated at. integral() passes in a vector to be evaluate...

22 hours ago | 0

Answered
Reading from and writing to Google Drive
https://www.mathworks.com/matlabcentral/answers/436564-how-can-i-read-image-from-my-google-drive-process-it-and-sent-the-output-...

22 hours ago | 0

Answered
find text in text file
fileread and regexp() 'split' using pattern '\r?\n' on that to get lines. Now regexp() that cell array of character vectors givi...

1 day ago | 0

Answered
Uiimage function suddenly stop working
https://www.mathworks.com/help/matlab/ref/uiimage.html needs r2019a

1 day ago | 0

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Answered
Closest Points between two datasets without using pdist2
A=[5 6; 1 2; 3 4 1 8]; B=[3 0; 2 1; 4 1; 3 5; 1 2]; P = permute(sum((A-permute(B,[...

1 day ago | 0

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Answered
nntool and training issues.
Click on View and then dismiss what pops up. Afterwards you will be able to edit all layers.

1 day ago | 0

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Answered
The degree of function is unknown
This is proving to be a challenge to implement in the general case. So far I have code that automatically reduces multiples of...

1 day ago | 0

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