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Walter Roberson


43 610 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
Communication Toolbox comm.GeneralQAMTCMDemodulator Question
No. It is a .p file and cannot be editted.

ungefär 3 timmar ago | 0

Answered
Why I am getting "Constraints are not satisfied within constraint tolerance." from using "gamultiobj"?
Infeasible individuals are present in the final population. This means that not enough feasible locations were found to displa...

ungefär 4 timmar ago | 0

Answered
gui uitable choice list linkage
This cannot be done with a uitable for traditional figures. uitable for traditional figures implement menus by setting the ent...

ungefär 5 timmar ago | 1

Answered
How to set the volume of beep sound and save it as wav?
You forgot to mention that you are using Psychtoolbox 3. audiowrite('NameOfWavFile.wav', beepWaveform, 44100); However, it is ...

ungefär 6 timmar ago | 0

| accepted

Answered
help me debug this script!
n = 1:35 dataset_pfc_tar_57_n = dataset_pfc_tar_57(n,:) With n being a vector of length 35, dataset_pfc_tar_57_n is going to h...

ungefär 6 timmar ago | 0

| accepted

Answered
Why does the resolution become extremely bad when increasing the linewidth when using the the circle as marker.
OpenGL has no built-in markers. All that it has are built-in square points. Therefore in order to create the markers, MATLAB has...

ungefär 6 timmar ago | 0

Answered
Index exceeds matrix dimensions
num_padding = round(length(temp_x)*0.5);% padding number length is defined as: temp = size(TheInput) if any(tem...

ungefär 7 timmar ago | 0

Answered
How to iterate through a Matrix using for loops?
The code does go through all of the different theta values. However, your for el loop writes to the same places in KG for each d...

ungefär 7 timmar ago | 0

Answered
using improfile in 2D image.
surf(my_image, 'edgecolor','none')

ungefär 12 timmar ago | 0

Answered
how can i set random number generation limit?
You will need to use https://www.mathworks.com/help/stats/prob.normaldistribution.truncate.html to truncate the probability dist...

ungefär 13 timmar ago | 1

Answered
Why does ode45 generate different sized vectors depending on how output is defined?
https://www.mathworks.com/help/matlab/ref/ode45.html#d117e989842 sol = ode45(___) returns a structure that you can use with dev...

ungefär 13 timmar ago | 1

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Answered
I am getting a blank graph when I try to plot a while loop. I am not sure why. My code is below. Thank you MATLAB
You are plotting one point at a time but you have no marker specified. MATLAB never deliberately joins points from different ...

ungefär 18 timmar ago | 1

Answered
How to use scatter function with different marker, markerFaceColor?
You will need to get a job or internship with Mathworks with the goal of extending the scatter object to handle multiple markers...

ungefär 18 timmar ago | 0

Answered
Drawing shape from coordinates
Computer Vision Toolbox insertShape function

ungefär 19 timmar ago | 0

Answered
What units is the number in strel('disk', 22)?
Pixels. Or more correctly, memory locations, as the result is used in multiple contexts and makes no attempt to handle multip...

ungefär 19 timmar ago | 0

| accepted

Answered
'.' is not an internal or external command, nor is it a runnable program or batch file
You are trying to run Linux code on ms windows. You will need to change the / in the system() command to \

en dag ago | 1

Answered
how to open .mat file in matlab?
You are calling importfile1() without passing in a parameter. You cannot run importfile1() just by clicking the green Run butto...

en dag ago | 1

| accepted

Answered
Using strfind to find character index in word
Guess1 = 'e'; HangWord = "each"; index = strfind(HangWord, Guess1);

en dag ago | 0

Answered
Is vaderSentimentScores available in R2019a
No, it was introduced in R2019b. See https://github.com/cjhutto/vaderSentiment for python library and https://github.com/nunoac...

en dag ago | 0

Answered
Index Exceeds Number of Array Elements (1)? Line(5)
Line 5 is fid=fopen('Lab1_Problem1.txt'); In order to receive an index out of range in that line, you would have to have a var...

en dag ago | 0

Answered
How to crop multiple images?
Yes, imageSet requires the Computer Vision Toolbox. imageDir = 'D:\Masters Thesis\ssss'; dinfo = dir(imageDir); dinfo([dinfo....

en dag ago | 0

Answered
How put a gif on GUIDE
GUIDE does not directly support playing GIFs. What you can do is read the frames of the GIF and store them in an accessible pl...

en dag ago | 0

| accepted

Answered
plotting graph and mark points
d = xlsread('FaceFour_TRAIN.xlsx'); plot(d); hold on idx = find(d>0.04); pointsize = 20; scatter(idx, d(idx), pointsize, 'b...

en dag ago | 0

Answered
how plot only show the value which I selected
Location = menu('Please select a loaction',LocationID); assigns to a variable named Location with an upper-case L fprintf('On ...

en dag ago | 0

Answered
How to compare two matrix?
nnz(A == 1 & B == 3)

en dag ago | 0

| accepted

Answered
Optimisation of a filter knowing input and output
First order low pass filters only have a very small number of parameters. If you look at the discrete description at https://en....

en dag ago | 0

Answered
How to avoid the user insert a number with a wrong value
Preventing the user from entering a number that is invalid for the currently selected base is complicated. It requires checking ...

en dag ago | 0

Answered
Help I can't get my code to execute
xd = (-1)*(r)*(thd)*sin(theta)-(numer/(2*sqrt(denom))); where denom = ((c^2)-(r^2)*(theta)); but denom can be negative, and s...

en dag ago | 1

| accepted

Answered
I'm using old matrix in given data and adding user data to add onto old matrix. Example Days(16x1), Location(16x5), LocationID(1x5) and when user inputs a day its supposed to add onto Days, Same with new location and LocationID.
Days2(D2) D2 contains day numbers such as 52 and 60, but there are only 16 (before additional data) or 21 (after additional dat...

en dag ago | 0

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