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Walter Roberson


42,206 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
How to make solve() return a purely symbolic output?
No there is no way to prevent it. You have to not assign values to the variables if you do not want the values used.

4 hours ago | 0

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Answered
text file I/O
We already explained. If you are passed something that is a character but the character is not found in the file then you need t...

4 hours ago | 0

Answered
How can I generate a random number between a specific range?
rand(rows, columns) * 50 + 50 csvwrite

11 hours ago | 0

Answered
How to integrate with SAP ERP
https://blogs.sap.com/2018/02/13/integration-of-matlab-compiler-runtime-in-sap-hana-extended-application-services-advanced-model...

11 hours ago | 0

Answered
xlsread function and ranges
"A"+((n-1)*48+1)+":B"+(n*48)

11 hours ago | 1

Answered
When running code it returns >> pp01 Error using plot Error in color/linetype argument. Error in pp01 (line 33) plot(t(:),z(:,1),'W',t(:),z(:,2),'F')
'W' is valid as a code for White but 'F' is not a color abbreviation and is not a marker shape code. Valid codes are * b: blu...

12 hours ago | 0

Answered
Unexpected error: A timeout occurred during the write operation..
Increase the serial output buffer size and also send less in one fprintf. Renegotiate the protocol with the other side so th...

13 hours ago | 0

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Answered
is WLAN toolbox available in MATLAB 2018 version?
R2016a and later. Note that it is not available for Student licences.

13 hours ago | 0

Answered
why getpts doesn't give the correct points?
imshow() by default sets YDir reverse so that the "top" of the array (lowest row number) appears at the top of the screen (which...

15 hours ago | 0

Answered
How can I install mosek in matlab for free?
https://www.mosek.com/products/academic-licenses/ Personal academic license for mosek are free.

16 hours ago | 0

Answered
how do I fit a double exponential equation? there are two double exponential waveforms and I need to fit the equation into each waveform
You can use cftool with a custom equation. Be warned that sum of exponential are notoriously difficult to fit. If your initia...

18 hours ago | 0

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Answered
Generated figure but no plot
After your for loop psi is a scalar.

18 hours ago | 0

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Answered
remove rows with duplicates
need_to_delete = [false; any(ismember(YourArray(2:end,:), YourArray(1,:)),2)]; YourArray(need_to_delete, :) = [];

21 hours ago | 0

Answered
Unable to save file for Quiver
You can never imwrite() a graphics object, including not even if it is an image. Some kinds of graphics objects (such as images...

23 hours ago | 0

Answered
Error using the igrfmagn function (collecting the output)
time = 100; [mag_field_vector, hor_intensity, declinatioon, inclination, total_intensity] = deal(cell(size(time))); for i = 1:...

23 hours ago | 0

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Answered
Writing equations in a matrix form
For any one particular scalar k and scalar m, you can express sum_{j} sum_{i} c(i,j,k,m) in range 0 to 1 as a linear constraint....

23 hours ago | 0

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Answered
How to solve the following errors?
You refer to extplottingIter . We do not have enough information to know whether that is a function name or the name of a variab...

1 day ago | 0

Answered
Does audioread not return a vector?
No, often audioread() does not return a vector. audioread() normally returns a 2D array with one column per channel. Note: you ...

1 day ago | 0

Answered
Best way to import millions of rows of data using ODBC to connect to AS400?
https://support.office.com/en-us/article/access-specifications-0cf3c66f-9cf2-4e32-9568-98c1025bb47c Microsoft Access maximum ta...

1 day ago | 0

Answered
Simple Matrix Manipulation Help
There is no solution for that. solve(A*X == B) Look at entry #11 in B, where you have a 0 where the sequence would otherwise p...

1 day ago | 0

Answered
separate table data in to sub tables
G = findgroups(YourTable.name); output = splitapply(@(varargin) {table(varargin{:}, 'VariableNames', YourTable.Properties.Varia...

1 day ago | 0

Answered
Format of mat file in Version R2019a
The documentation for MAT 1.0 and MAT 2.0 files is lost to history as far as I can tell. The documentation for MAT 3.0 and MAT ...

1 day ago | 0

Answered
What's the difference between Matlab runtime and Matlab(R) Compiler Runtime
The 7.14 software is for applications compiled with r2010b

1 day ago | 0

Answered
How can I generate reciprocal of a matrix
I suspect that you want inv(A) but possibly you want 1./A In most cases inv() is better avoided in favor of using the \ opera...

1 day ago | 0

Answered
how i can save the value of two signals when they are equal
N = 14; a = zeros(1, N); b = 1; for K = 1 : length(signal_1) if signal_1(K) == signal_2(K) a(b) = signal_1(K); ...

1 day ago | 1

Answered
License Manager Error -9
Yes. It is permitted to run MATLAB dual-booted on the same machine, as long as the hardware identification information matches. ...

1 day ago | 1

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Answered
STRING ARRAY TO NUMERIC VALUES ( I want to change the array's type to plot the graph, even though I use double function or str2num that doesn't change anything and it still string)
new_frequency(1:rowRPM(1,1)) = str2double(frequency(1:rowRPM(1,1))); In the special case where you are converting all of the en...

1 day ago | 1

Answered
How to make a matrix with negative indexes?
Modify https://www.mathworks.com/matlabcentral/fileexchange/33301-zero-based-indexable-arrays-oop-exercise Another approach is...

1 day ago | 0

Answered
How I can repeatedly divide a binary image ?
Code for repeatedly dividing was provided at https://www.mathworks.com/matlabcentral/answers/456856-how-can-i-loop-over-a-binary...

1 day ago | 0

Answered
Adding multiple fields and values to structure array
Provided you are setting all of the fields of data(k), then you can use data(k) = struct('PairNum', pairNum, 'level', level, 't...

1 day ago | 1

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