Walter Roberson
I do not do free private consulting. If you want to bring my attention to something, send a link to the MATLAB Answers location.
Statistics
RANK
1
of 239,273
REPUTATION
113,544
CONTRIBUTIONS
34 Questions
51,713 Answers
ANSWER ACCEPTANCE
52.94%
VOTES RECEIVED
14,525
RANK
of 16,804
REPUTATION
N/A
AVERAGE RATING
0.00
CONTRIBUTIONS
0 Files
DOWNLOADS
0
ALL TIME DOWNLOADS
0
CONTRIBUTIONS
0 Posts
CONTRIBUTIONS
0 Public Channels
AVERAGE RATING
CONTRIBUTIONS
0 Highlights
AVERAGE NO. OF LIKES
Reach 100000 reputation points. Honors the first contributor to reach this milestone, Walter Roberson
Awarded to Walter Roberson on 14 Aug 2020
The contributor whose answers received the most acceptances in 2019
Awarded to Walter Roberson on 01 Jan 2020
Solve a problem for the first time
Awarded to Walter Roberson on 10 Jun 2017
Publish your first review
Awarded to Walter Roberson on 09 Oct 2019
The contributor whose answers received the most acceptances in 2018
Awarded to Walter Roberson on 18 Jan 2019
The contributor whose answers received the most acceptances in 2017
Awarded to Walter Roberson on 02 Jan 2018
Contribute at least one answer each month for 36 consecutive months
Awarded to Walter Roberson on 20 Jul 2017
The contributor whose answers received the most acceptances in 2016
Awarded to Walter Roberson on 20 Jul 2017
The contributor whose answers received the most acceptances in 2015
Awarded to Walter Roberson on 20 Jul 2017
The contributor whose answers received the most acceptances in 2011
Awarded to Walter Roberson on 20 Jul 2017
The contributor whose answers received the most acceptances in 2012
Awarded to Walter Roberson on 20 Jul 2017
The contributor whose answers received the most acceptances in 2013
Awarded to Walter Roberson on 20 Jul 2017
Content Feed
Matlab r2020a becomes extremely laggy after several hours
If you are using any window management program such as Magnet, then disable that or configure MATLAB to be excluded. If you h...
1 hour ago | 1
why do I get a strange result with griddata cubic?
This is expected behavior when there are sharp edges, especially with a surrounding flat area. B-- | -A- Es...
3 hours ago | 0
How to create a structure array?
findgroups(), and use the group numbers to splitapply() where the work function is @(x){x} . The results should be a cell array....
3 hours ago | 0
append rows of a table
The general solution is to vertcat or [;] a cell array that has the same number of columns that as the table has variables. This...
3 hours ago | 0
gui size problem on another computer
https://www.mathworks.com/help/matlab/ref/matlab.ui.control.uicontrol-properties.html#d123e1411378 The default Units for uicon...
1 day ago | 0
How to change the default range of hyperparameters in fitcecoc function?
In the section https://www.mathworks.com/help/stats/fitcecoc.html#d123e297982 Set nondefault parameters by passing a vector of...
1 day ago | 0
how to calculate the gamma function when the variables are the complex numbers?
The Symbolic Toolbox can calculate it. format long g a = sym(complex(randn, randn)) g1 = gamma(1/4 + 1/2*1i*a) double(g1)
1 day ago | 0
| accepted
how to use setvartype on a table that is already existing
Can someone tell me how to set all the variable types to one uniform type using setvartype function? That is not possible. setv...
1 day ago | 0
I want to shorten a string.
If it is a string() object then see extractAfter()
2 days ago | 0
Which Processor and how much RAM is required?
https://www.notebookcheck.net/AMD-Ryzen-7-5700U-Processor-Benchmarks-and-Specs.510416.0.html That Ryzen does support AVX2. If...
2 days ago | 0
Support vector machine for multi-class
https://www.mathworks.com/help/stats/classificationecoc.html#bue3o6e-12 So use one row for each sample, and the columns are th...
2 days ago | 0
| accepted
how to create a variable without assigning a value to it and also the variables shouldnt be symbolic variables
syms e d m = [27.5084 -10.7668 -9.7727;-20.6533 15.8060 14.8502]; k1 = m * e; %not used k2c = arrayfun(@(V) tf(V,[1 ...
3 days ago | 0
| accepted
storing loop values in a matrix
N = 10; iters = 5; column = randi(9,N,1) results_of_loop = zeros(N, iters); for K = 1 : iters results_of_loop(:,K) = co...
3 days ago | 0
| accepted
i need help writing code in matlab that will plot data of 4 different variables onto one graph
format long g data = { 'earth', 14.3145, 2756.22, 228.060 'venus', 15.0717, 3580.80, 224.65 'mars', 13.7819, 27...
3 days ago | 0
Efficient way to implement this UDP protocol for loopback IP
udp does not synchronize: is is completely happy to send of 1000 packets from a source in the time before the first of them is p...
4 days ago | 0
| accepted
Can I substitute a particular expression?
There are two scenarios: 1) syms k sigma positive A = [k, k^(1/2), k^(3/2), k^(5/2)] B = subs(A, k, sigma^2) That is, if ne...
4 days ago | 0
| accepted
How do I convert this math expression to MATLAB code?
U = arrayfun(@(idx) randn(m,m), 1:2*T, 'uniform', 0);
4 days ago | 1
| accepted
Iterative solution for a non-linear equation
format long g Sa = 2.7956; A = 2.24; B = 0.5547; Gamma_p = @(ag_p) A+B*ag_p; f = @(ag_p) ag_p*Gamma_p(ag_p) - Sa; z = fz...
4 days ago | 0
| accepted
Is Oracle Java JRE license included with Matlab license?
The situation might be different on Windows, but on Mac and Linux, version -java and that version is the last free one accordi...
4 days ago | 0
| accepted
How can I reference the content of an UIAxes
Not directly, not without some careful analysis of properties. The issue is that live video, and video files, and screen shots,...
4 days ago | 0
how to create an array of plots in App designer
In the lines app.H_PlOT.XData(1:app.index) = 1:app.index; app.H_PlOT.YData(1:app.index) = 1:app....
4 days ago | 0
Removing moire pattern from an image
filename = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/210517/MatlabThing.png'; I = imread(filename); I=im...
4 days ago | 0
Problems with 'uigetfile' and 'imread' in simple MATLAB Web App
My interpretation would be that libTiff on the server is not the same as libTiff on the online version. In particular if you a...
5 days ago | 0
Incorrect dimensions for matrix multiplication
XI= zeros(1,nmax); YI= zeros(1,mmax); XI and YI are the same size. S2= S2+(4*XI*YI*ZI)*((T_ini-T_ts)*exp(-alpha*landa2(n,m,l...
5 days ago | 0
skipping files in for loop
Change if ~isempty(w)%If h is not empty, then its a reference image, calculate to if ~isempty(w{s})%If h is not empty, the...
5 days ago | 1
| accepted
How to extract the annotation file of XML data using MATLAB?
(tested) T = readtable('000001.xml'); img = imread('000001.jpg'); x = T.xmin; width = T.xmax - x + 1; y = T.ymin; high = T...
5 days ago | 0
| accepted
How to write a range of numbers in MATLAB?
theta = (0:60).'; and remember to use cosd() and sind() Notice the .' there: it is transposing the 0:60 from a row vector into...
5 days ago | 0
Unrecognized property 'Title' in heatmap function
which -all heatmap I suspect that you are using a third party heatmap function
5 days ago | 0
| accepted
Error using actxserver(line 90). Server creation failed. Invalid ProgID 'Excel.Application'. with MAC and Matlab R2017b
https://www.mathworks.com/help/matlab/ref/actxserver.html says that actxserver() is only available for Windows. The Mac version...
5 days ago | 0
Trying to transmit and receive a simple waveform via loopback on B210 radio
Not really, no. See https://www.mathworks.com/matlabcentral/answers/336589-how-can-i-simultaneously-transmit-and-receive-using-...
6 days ago | 0
