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Walter Roberson


43.017 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 i can specify data transfer rate for data transfer from one node to other
However you want. You are programming the network representation from scratch so design it in a way that this is meaningful for ...

circa 12 ore ago | 0

Answered
Not able to append to an empty container map
https://www.mathworks.com/help/matlab/ref/containers.map.html The default key type is char, so use the keytype valuetype opti...

circa 12 ore ago | 2

| accepted

Answered
Simplify symbolic expressions with custom constraints
No it is not possible.

circa 19 ore ago | 0

Answered
How to check if a specific 'part' of a cell array exists?
numel(burstcountdata) < x Then the element doesn't exist

circa 19 ore ago | 0

| accepted

Answered
How do I exactly pass function handles for MATLAB callbacks?
MATLAB automatically passes callbacks handle of the current object, and event data (typically empty or a struct, sometimes an ob...

1 giorno ago | 1

Answered
Is it possible to load a variable that can not be cleared
Create a function named X.m that when given the argument 'load' loads the value of X from a file and puts it into a persistent v...

2 giorni ago | 0

Answered
Unexpected error with imfill
That particular syntax is only valid if your input array is type logical, but your BW1 is some other data type. For example, it ...

3 giorni ago | 0

| accepted

Answered
Writing matlab table to excel with spaces in variable names?
No. You will need to convert your content to cell and put the desired names as the first row, and write the cell (without variab...

3 giorni ago | 0

| accepted

Answered
For loop, Subscript indices must either be real positive integers or logicals ?
https://www.mathworks.com/matlabcentral/answers/470959-loop-with-two-variables#answer_382585 shows a general structure you can u...

3 giorni ago | 0

| accepted

Answered
How to update a complicated figure ?
Create your patches once, not every time you rotate. Update the Vertices of the patches instead of creating new patches. You ...

3 giorni ago | 0

Answered
Previously purchased simulink packages
As long as you stay with the same license then you retain rights to access those toolboxes. However they will not necessarily be...

3 giorni ago | 0

| accepted

Answered
plz help me with the integration of this eq from 0 to infinity e(^(-ax))(1+jx/b)^-ndx where n>0
>> syms a b x >> syms n positive >> int(exp(-a*x)*(1 + x*1i/b)^(-n), x,0,inf) ans = piecewise(angle(1i/b) < pi & (angle(a) ...

3 giorni ago | 0

| accepted

Answered
How to change data files of a deployed web app and maintain this change across sessions
The closest you can get is at run time figure out a suitable directory to check for files and to store into when the user makes ...

3 giorni ago | 1

| accepted

Answered
For loop error: Subscript indices must either be real positive integers or logicals
http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F mat2str((find((0:0.1:10)*10-(0:10...

3 giorni ago | 0

Answered
CIFAR - 10 dataset kaggle
When you use imageDataStore, use 'labelsource', 'none' . But after you create the object, set its Labels property to a cell arra...

4 giorni ago | 1

| accepted

Answered
Finding Lines in a Large Text File with a Specific Text
If you have enough memory: S = fileread('YourFileNameHere.txt'); selected = regexp('^.*<fieldname\s*=.*$', 'match', 'dotexcept...

4 giorni ago | 0

Answered
How to specify an exact value of variable in (For Loop)
for i=1:3 x(i)=i+2; end x(2:3)

4 giorni ago | 0

| accepted

Answered
Running a simulation with a specified number of bits of precision
Not exactly. However, you can use Fixed Point Toolbox to create 16 bit objects with various properties. https://www.mathworks.c...

4 giorni ago | 0

Answered
selecting audiofile from app (appdesigner) and then run the file doesnt work
This is completely expected. run() does not execute within the context of the base workspace: run() executes within the context ...

4 giorni ago | 0

Answered
How to post process each variable in a mat file ?
S = load(filename) fn = fieldnames(S) Fc = length(fn) for k = 1 : Fc F = fn{k} Data = S.(F) Process Da...

4 giorni ago | 1

| accepted

Answered
range in symbolic form
ch = children(solution); [children(ch(1)),children(ch(2))]

4 giorni ago | 0

Answered
binning a matrix down
imresize()

4 giorni ago | 0

Answered
Error Opening File with readtable
Inside your loop name is a cell array of character vector and strcat involving it is going to return a cell array of character v...

4 giorni ago | 0

Answered
Why is my modulus giving me an error: Index in position 1 exceeds array bounds (must not exceed 1).
mod = mod(col,12); After the first of those, mod is no longer a function because you have assigned a number to mod

4 giorni ago | 0

| accepted

Answered
While loop stop when repeat answers
old = nan New = nan while old ~= New old = New New = whatever end

4 giorni ago | 0

Answered
Can image processing in the MATLAB program be converted to an application ?
Generally yes, many image processing applications can be compiled with MATLAB Compiler, or sometimes MATLAB Coder. But it de...

4 giorni ago | 0

| accepted

Answered
solve a 3 equations and 3 variables for images
X = A\double(B)

4 giorni ago | 1

| accepted

Answered
What does a\\r\n1 mean in MATLAB?
It was an artifact for that one release. It indicates carriage return and linefeed. It only occurs in the printed representation...

4 giorni ago | 0

Answered
request about activation key
NO. It would violate our licence agreements with Mathworks if we were to send you an activation key. No-one here is going to ...

4 giorni ago | 0

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