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. I am currently caught up to T0099119; if you are waiting on a reply from me for an older issue, please send me a reminder.
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Content Feed
Unique workspace for each instance of Interpreted MATLAB Function block?
https://www.mathworks.com/help/simulink/ug/model-global-data-using-data-stores.html "In this example, the top model uses a sig...
19 minutes ago | 0
Is it possible to process the sparse matrix faster with vectorization instead of for loop?
Point_Data = readmatrixread('E:\pointdata.txt'); % Point Data = xyz coordinate data of 3D points r = 4; mdl = KDTreeSearcher...
33 minutes ago | 0
What can I use instead of 'lsqcurvefit'
lsqcurvefit()'s normal output is "local minima possible". The only time you do not get that message is if the fitting is being...
5 hours ago | 0
How do I write a .LAS file from .mat data?
guid1 = uint32(0); %32 bit guid2 = uint16(0); %16 bit guid3 = uint16(0); %16 bit guid3 = blanks(8); %unsigned char 8 b...
7 hours ago | 0
How to run the same code over and over with one different detail of an event changing each time (temperature the cooling water turns on).
You already have [t1,y1,te,ye,ie] = ode15s(@(t,y)fun(t,y(1),y(2),y(3),y(4),y(5),y(6),iflag), tspan, initial_conditions,options)...
8 hours ago | 0
Definite integration using int command
h = 5; a = 2; syms y x = 3.8; p = 2.*x.^2+2.*a.*y; q = x.^2+y.^2; r = x.^2+a.^2; f = (-1./sqrt(1-(p.^2./(4.*q.*r)))).*...
8 hours ago | 0
system command in parfor loop
parpool tic parfor i=1:nfiles cmd = sprintf('echo "%s" | multi.exe', str3{i,1}); [status,cmdout] = system(cmd, '-ech...
9 hours ago | 0
Laplace transform not getting Value
syms x(t) Xs eqn = diff(x,t,2)+2*diff(x,t)+26*x(t) == 10*cos(t)*(heaviside(t-pi)); eqnLT = laplace(eqn) eqnLT = subs(eqnLT,l...
1 day ago | 0
Error: Unrecognized function or variable 'getMatchedFilter'.
The input to getMatchedFilter must be a phased-encoded waveform object, but instead you are just passing in double precision arr...
1 day ago | 0
Appending multiple Excel files using script
input_dir = '/MATLAB Drive/Project11/xin'; %directory excel files are stored in input_extension = '.xlsx'; %or .xls output_...
1 day ago | 1
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Error: Insufficient number of outputs from right hand side of equal sign to satisfy assignment in ft_read_mri
ftver = tmp.Version; Somehowm, tmp is an empty struct or object (that does have a field or property named Version) . Rememb...
1 day ago | 0
Why the audioread function is giving data samples in two coloum?
That indicates that the audio has two channels (stereo)
1 day ago | 0
How to make the question reappear if someone mess up with the number ? eg. 0 to 4. And then someone type 5.
while true ques_1 = input('\nIn the last month, how often have you been upset because of something that happened unexpected...
2 days ago | 0
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how to do pcolor plots from 3d data?
x=100; y=100; z=100; r = randi([1 5],x,y,z); cmap = [0 0 0; 1 0 0]; mask = double(r(:,:,60) == 1); imagesc(mask, 'AlphaDat...
2 days ago | 0
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how to discretize the 3-D surface into individual points in MATLAB
F = @(X, Y) sin(X).^2 - cos(3*Y).^2; %equation of the surface xvec = -1:0.1:1; yvec = -3.2:.1:3.2; [x, y] = meshgrid(xvec...
2 days ago | 0
imread, reshape and zeros function syntax problems
imread() returns the data type stored in the file. The most common data type stored in image files is uint8(), but there are oth...
2 days ago | 0
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circshift function working explanation needed
M = (10:10:40).' + (1:9) circshift(M, -1) You can see that this is the same as [M(2:end,:); M(1,:)] And more generally, circ...
2 days ago | 0
How to save image after encryption?
My suspicion would be that your original image is uint8 and that when you did the encryption, you did not make sure to create ui...
2 days ago | 0
Solving Equaiton with multplying power
syms A B C syms X Y Z integer eqn = (B*C^-1)^X * (B)^Y * (A*B^-3)^Z * (B^3*C^-1) == A^0*B^0*C^0 seqn = simplify(lhs(eqn)) == ...
2 days ago | 1
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Workspace Updates when script is complete?
Correct. Generally speaking, there would be too much overhead to continually update the workspace browser when you are not stop...
2 days ago | 0
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Overlay gray ROI on an image
newI(row1 : row2, col1 : col2) = repmat(GrayRoi, [1 1 size(newI,3)]);
2 days ago | 0
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read/write csv file
dlmwrite() offers the option -append . Note, however, that this is restricted to writing additional rows immediately after all ...
2 days ago | 0
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call a variable in a timetable from a cell matrix
for 1 = 1:10 a(:,i) = Timetable.(VariableNamesMatrix{i}); end But you should consider just using a = table2array(Timetab...
3 days ago | 0
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python to Matlab udp communication
https://www.mathworks.com/matlabcentral/answers/319729-how-can-i-receive-udp-broadcast-data-in-matlab-using-instrument-control-t...
3 days ago | 0
Issue with native2unicode and windows-1252 encoding
source = char(0:511) bytes = unicode2native(source, 'windows-1252') backport = char(bytes) whichdiffer = find(source(1:256) ~...
3 days ago | 0
Horizontal concatenate in UItable table
oldData(i)={horzcat(oldData{i,:})}; Let us look at what that is being asked to do for i == 1: oldData(1,:) = ...
4 days ago | 0
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Saving plot as a GIF
%This code assumes that you might be changing x inside your loop. If x is %constant then it can be done a little better. fil...
4 days ago | 0
Solving an equation with two vectors
You have 37411 equations in one single variable. There is no value, p, such that all of the equations are satisfied simultaneous...
4 days ago | 0
How to generate a rhythm that is based on an algorithm in matlab?
a = 5, b = 13 positions = floor(linspace(1, (b+1), a+1)) rhythm = zeros(1,b); rhythm(positions(1:end-1)) = 1
4 days ago | 0
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