Walter Roberson
Last seen: Today
49,991 total contributions since 2011I do not do free private consulting. If you want to bring my attention to something, send a link to the MATLAB Answers location.
Walter Roberson's Badges
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
The contributor whose answers received the most acceptances in 2018
Awarded to Walter Roberson on 18 Jan 2019
Solve a problem for the first time
Awarded to Walter Roberson on 10 Jun 2017
Publish your first comment or rating
Awarded to Walter Roberson on 09 Oct 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
Accept 50 answers given by other contributors
Awarded to Walter Roberson on 20 Jul 2017
Reach 25000 reputation points
Awarded to Walter Roberson on 20 Jul 2017
Answer 50 questions that were unanswered for more than 30 days
Awarded to Walter Roberson on 20 Jul 2017
How can I animate this plot3?
geoplot3() returns a line object. You can pull the XData, YData, ZData coordinates out of the line object and delete the line ob...
7 minutes ago | 0
Call mex function using system()?
In Linux, executables can have any valid file name. The file extension is not considered by the operating system when deciding h...
12 minutes ago | 0
Using the Cancel button in uiprogressdlg to immediately stop execution
https://www.mathworks.com/matlabcentral/answers/496530-using-timer-how-can-i-cleanly-exit-a-function-execution-when-the-timer-fi...
35 minutes ago | 0
Creating regenerative random numbers
rng(655321) %or use any other positive integer constant
1 hour ago | 0
valid indices for 'output' are restricted in parfor loop
for j= 1:100 SNR = list(j); base = (j-1)*1000; parfor i = 1:1000 totallist(base+i,1) = SNR; ou...
1 hour ago | 1
| accepted
How to get matlab to read the code
Your code has load(strcat('C:\Users\User\Dropbox\My PC (LAPTOP-8G4JCC0U)\Documents\onscale',num2str(i),'\2d_simple_array.ma...
3 hours ago | 0
How can I create a matlab matrix below?
N = 6; diag(-2*ones(1,N)) + diag(ones(1,N-1),-1) + diag(ones(1,N-1),1)
3 hours ago | 0
How can i find unknown variable in matrix
syms D [2 1] syms AE sols = solve([0; -2] == AE * [0.405 0.096; 0.096 0.128] * D + [0; 0],D) simplify([sols.D1; sols.D2]) Th...
3 hours ago | 0
| accepted
I need help figuring the code out.
You can use a Monte Carlo method: format long g R = randi([2 3]) xy = rand(10000,2) * exp(R); x = xy(:,1); y = xy(:,2); mas...
4 hours ago | 0
Using isnan to check if there is any NaNs in a window and setting all the values to NaN if there are any.
for i=1:11:T; for k=1:3; if any(isnan(y(i:i+11,k))) X(i:i+11,k) =NaN; end end end
4 hours ago | 0
| accepted
run the script without opening the figure, its possible?
set(0, 'DefaultFigureVisible', 'off') before you run the code. This will last for the rest of your MATLAB session unless you r...
7 hours ago | 1
How to define k in bcfun?
In bcfun, for ya, you sould calculate k based on the x that would be used for the first boundary condition, and for yb you shoul...
7 hours ago | 0
How do I declare varibles whose outputs are expected from Matlab simply without so many rules, like for example in c++?
You are trying to construct a vector of function handles. You cannot do that in MATLAB. This is because in MATLAB, () indicates ...
11 hours ago | 0
How to convert dataset of .mat to .tif files?
You need to use the Tiff() class https://www.mathworks.com/help/matlab/ref/tiff.html Use SamplesPerPixel = 38, and use ExtraSa...
20 hours ago | 0
Can we apply scatter3() on high dimension matrix?
Yes, but it can become quite difficult to understand. You can use scatter3(x, y, z, PointSize, Color) Here PointSize and Colo...
20 hours ago | 0
Using Two Expressions together in factor()
syms x y f = arrayfun(@factor, [x^2-y^2,x^3+y^3], 'uniform', 0); vertcat(f{:})
20 hours ago | 0
| accepted
infinite Integration of hyperbolic function
y5=@(x)(4*hh.^2-4.*(x.^2)); y6=@(x)y4(x)./y5(x); You have a division by a constant minus 4*x^2 . But that can pass thr...
21 hours ago | 0
| accepted
How to find the unknown for singular matrix
nulls = null(A); candidates = nulls./nulls(:,1); The columns in candidates should start with 1 ... unless they start with NaN ...
21 hours ago | 1
| accepted
How to use "inspect" command in compiled code using MATLAB compiler?
inspect() is a development tool that I would not expect to be compilable . https://www.mathworks.com/products/compiler/supporte...
1 day ago | 0
Can I assign a variable to a number in a matrix from another matrix?
A = magic(7) E = eig(A) w1 = E(1,1) w2 = E(2,1) w3 = E(3,1) m1 = 3; m2 = 11; m3 = -7; output = [ m1*w1^2 ...
1 day ago | 0
| accepted
how do I merge multiple matrices into one?
One approach N = 4; %50 in your original Rows = 2; %1111 in your original %generate some data for illustration M = ar...
1 day ago | 0
I'm trying to convert Matlab code to C++ or C, but it has some errors. Can someone help me with this?
My adjusted version of the code passes compilation, and produces graphs. However I can demonstrate that the algorithm is wrong. ...
1 day ago | 0
I need help with running two for loops
you do not reset dif when you move on to the next j value so the while will end immediately.
2 days ago | 0
closed form solution in a system of equation
There are four families of solutions. [X1 == 1, X2 == (cos(Lz1*h*sin(RootOf(Lz1^2*cos(Z)^2*h^2+cos(Z)^2*Z^2*k1^2-Lz1^2*h^2))/c...
2 days ago | 0
How to import and read multiple .txt files where each .txt file contains multiple number of x,y,z values??
You can use https://www.mathworks.com/help/matlab/ref/matlab.io.datastore.tabulartextdatastore.html Or projectdir = 'name_of_...
2 days ago | 0
Error: Array indices must be positive integers or logical values.
Please read https://www.mathworks.com/matlabcentral/answers/395816-why-do-i-get-array-indices-must-be-positive-integers-or-logic...
2 days ago | 0
Solving one equation with multiple variables
Substitute the first known time and known s(t) to get a linear equation. Do the same with the other two known values. You will e...
2 days ago | 0
fminsearch with 3 variables
example f=@(v)v(1).*v(2)-sin(v(1)+v(2)) Instead of f=@(x,y)x.*y-sin(x+y)
3 days ago | 0
| accepted
Array formation and parentheses-style indexing with objects of class 'matlab.io.datastore.ImageDatastore' is not allowed. Use objects of class 'matlab.io.datastore.ImageDatastore' only as scalars or use a cell array. Error in Untitled9 (line 30)
You are trying to index a datastore. Instead you need to create new datastore from indexing the file names. https://progi.pr...
3 days ago | 0
| accepted
Select a Web Site
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
Select web siteYou can also select a web site from the following list:
Americas
- América Latina (Español)
- Canada (English)
- United States (English)
Europe
- Belgium (English)
- Denmark (English)
- Deutschland (Deutsch)
- España (Español)
- Finland (English)
- France (Français)
- Ireland (English)
- Italia (Italiano)
- Luxembourg (English)
- Netherlands (English)
- Norway (English)
- Österreich (Deutsch)
- Portugal (English)
- Sweden (English)
- Switzerland
- United Kingdom (English)