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Walter Roberson


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45.420 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
Hello everyone, I have the following problem when running my model, these problem are shown below, Does anyone know How can I correct these errors? Thanks.
In order to discard the third element of the input bus, you need a third output on the demux, which you can connect to ground.

alrededor de 4 horas ago | 0

Answered
size of .mat file version 7.3
Yes, there is a reason for it. V7.3 uses a completely different file structure, using an international standard that is designed...

alrededor de 4 horas ago | 0

Answered
How to check if a matrix has a certain variable?
As you do not seem to feel that my earlier answer works for your situation: It is not possible to do what you want to do. As ...

alrededor de 4 horas ago | 0

Answered
what is the price of licence for academic
In many locations, but not everywhere, it is possible to get quotes and pricing for the most common tools through the online sto...

alrededor de 5 horas ago | 0

Answered
How to check if a matrix has a certain variable?
Rewrite A as M = [1 1 0; 0 1 1; 1 0 1]; A = M * X'; Now you can test if A(j) uses X(k) by testing whe...

alrededor de 7 horas ago | 0

| accepted

Answered
all graphs blank regardless of the code
You absolutely must rename your class.m to something else. class() is an important function in MATLAB implementation, and your c...

alrededor de 7 horas ago | 0

Answered
Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.
MATLAB has absolutely no implicit multiplication. (A)B is never valid in MATLAB. A(B) in MATLAB would always indicate either ...

alrededor de 14 horas ago | 0

Answered
how to write this constraint in fmincon
abs() can only be handled as a nonlinear constraint function [c, ceq] = nonl(x, w0)n c = sum(abs(x-w0)) - 0.3; ceq = ...

alrededor de 20 horas ago | 0

Answered
I tried to call a function but it failed
It is fundamental to the idea of functions in all programming languages that the variable names inside the function are internal...

alrededor de 20 horas ago | 1

Answered
Enforcing grouping in the Symbolic Math toolbox
You need to use either evalin(symengine) or feval(symengine) to issue commands directly to the symbolic engine, and you would ha...

alrededor de 22 horas ago | 0

Answered
I am have this problem, when click run the prog. the prog. asked me to enter the input argument by typing it?
You cannot run that code just by clicking on the green Run button. You need to call it from code, or you need to go to the comma...

1 día ago | 0

Answered
Issue regarding bandpass filtering
When you have a sample rate of 15 Hz, then the smallest time period you can resolve is 1/7.5Hz which is 0.1333 which is greater ...

1 día ago | 0

Answered
How to save a uitable as either a png, jpeg, pdf, excel?
saveas() or print() the figure . You might be able to create a new figure and copyobj() the uitable into it, and saveas() or pr...

1 día ago | 0

Answered
What is the best way to Enhance RGB images ?
No-one knows. It is currently believed that in order to figure out the best way to do that, that it is necessary to create all p...

1 día ago | 0

Answered
Help storing data from while loop
info_to_save(iter, :) = [iter, fr]; However, since you know that the iterations always increase by 1 each time, you do not need...

1 día ago | 0

| accepted

Answered
Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 1-by-2. don't know how to fix this
alpha = 8*ZL(I,J)/(pi^2*g*D(I,J)^5); beta(I,J) = (8*K)/(pi^2*g*(D(I,J)^4)); %#ok<SAGROW> The second part of that line is growi...

1 día ago | 0

Answered
finding the value of a in my fresnel equation
You are not going to get a closed form solution, so there is no point using solve() . Instead you should use vpasolve(). vpasol...

1 día ago | 0

Answered
How do I activate toolboxes
If you have not done so already, arrange with Mathworks Sales to have the toolboxes added to your license. (There are ways in w...

1 día ago | 0

Answered
Minesweeper help with resetting the display screen
clf() or cla() Anything beyond that would require knowledge of how you are drawing onto the screen at present.

1 día ago | 0

Answered
trying to get when I say yes it would repeat again and if no it stops the loop, but it would store all the yes values until i say no im like 95% almost done with it just need that part
choice= input('Enter a vector sufficent for an odd-order polynomial: '); if C == 5 && mod(a,2)~=0 As I told you in one ...

1 día ago | 0

Answered
Unable to perform assignment
this_scan = uint16(dicomread(slices)); ct_scans(1:size(this_scan,1), 1:size(this_scan,2), scan) = this_scan; This w...

1 día ago | 2

| accepted

Answered
hi , i have two graph one is fixed and the other one is changing (64 graphe )i want to find the most closest graphe to the fixed one .please help??
One approach is to use https://www.mathworks.com/help/stats/knnsearch.html knnsearch . That would get you a list of the closest ...

1 día ago | 0

Answered
How to perform handshaking operation
Unless the clock rate is very slow, there is no realistic way to monitor the clock edge at the MATLAB level in order to determin...

2 días ago | 0

Answered
Using m script in matlab
fopen the file for 'a+' permission, and *without* the t attribute. It is important that you do not use 't' Now fseek() on the...

2 días ago | 1

Answered
How to filter winter months
There does not exist a number that is simultaneously at most 4 but at the same time also greater than 9. & is only satisfied if ...

2 días ago | 1

Answered
What's wrong with my symbolic function?
MATLAB does not offer the syntax Value1 Relationship1 Value2 Relationship2 Value3 in the meaning you were thinking. In M...

2 días ago | 1

Answered
Variable Depth Struct Field Reference
Mohammad Sadi's approaches are fine. There is another class of approach though. You can split the string at periods, creating a ...

2 días ago | 0

Answered
Error with integration Not enough argument
We cannot see how you created t but the error message tells us that y2 is double precision, and that could only happen if t is d...

2 días ago | 0

Answered
Invalid use of operator "
The ... ends the line immediately. There is no implied separator inserted. So you have a ] from the numeric list followed by the...

2 días ago | 0

Answered
Many legend on a figure
Why should anyone answer this question when it is almost certain that you will attempt to get rid of the question afterwards?

3 días ago | 1

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