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Walter Roberson


Last seen: Today Active 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. 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.

Programming Languages:
C, MATLAB, Shell, Perl, Fortran
Spoken Languages:
English

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Answered
Is it possible to reconstruct an image from the number of pixel counts and bins information?
I = imread('pout.tif'); imshow(I) I1 = reshape(sort(I), size(I)); imshow(I1) [c,b] = imhist(I); [c1,b1] = imhist(I1); all(...

35 minuter ago | 0

Answered
I need to read an array to see if it has repeated elements (using for loop)
cont =0; for i=1:length(Vec)-1 for j = i+1:length(Vec) if Vec(i) == Vec(j) ...

ungefär 3 timmar ago | 0

Answered
How does this function work? - echo, assert ...
The function does none of the actual work needed. Instead it overrides the functions that are used to check that the solution wo...

ungefär 6 timmar ago | 2

| accepted

Answered
Run Simulink Simulation from using Matlab Engine API for C
https://www.mathworks.com/help/matlab/calling-matlab-engine-from-c-programs-1.html There is no specific interface for Simulink...

ungefär 6 timmar ago | 0

Answered
Losing pixels with imrotate
No there is no way. In every case where you rotate by something that is not a multiple of 90 degrees, pixels will change. Con...

ungefär 7 timmar ago | 1

Answered
How can I define a symbolic function with vector arguments?
You cannot do that in MATLAB. You can use matlabFunction with the 'vars' option to generate a function handle that indexes in...

ungefär 11 timmar ago | 0

Answered
Simplifying results from rat function
[N,D] = rat(0.642857142857143)

ungefär 24 timmar ago | 1

| accepted

Answered
How to shifting or move the time axis to the left in a MATLAB plot.
Pass the coordinates of the independent axes to plot() before the dependent coordinates -- plot(x,y)

en dag ago | 0

Answered
Unable to find explicit solution
If you look carefully at the graph, you can see a couple of discontinuities at negative t values. At first I thought it was a ...

en dag ago | 0

Answered
Hi, I wanted to implement MATLAB code "the scrambled pixel value is further converted to binary information sequence of size 8 bits ".
https://www.mathworks.com/matlabcentral/answers/527513-converting-image-to-bits-and-vice-versa#comment_1942575

en dag ago | 0

Answered
pathdef.m dont execute in 2020a
User turns out to have F:\feature.m that is interfering with use of system_dependent()

en dag ago | 1

| accepted

Answered
How to put conditions to use data from command window
Assuming that CD is a scalar, and that AB and BC are column vectors and that Speed is a row vector: statuses = ["unsuccessful",...

en dag ago | 0

Answered
Need Help Understanding a Line of Code Related to Strings
c.simcmd = 'set path=($path /cad/cadence/IC615.06.15.502.lnx/tools/bin); /cad/cadence/MMSIM13.ISR12.11.292.lnx86/tools/bin/spect...

2 dagar ago | 1

Answered
Symbolic summation of vectors/matrices
In MATLAB, it is tempting to use symsum(), but unfortunately that will not work. The difficulty is that the variable of summatio...

2 dagar ago | 1

| accepted

Answered
how to convert an image into bits???
reshape() to reconstruct the image. The remote side will need to know the image size, so either the size will need to be fixed o...

2 dagar ago | 0

Answered
I dont understand, i try to use solve to find x in Matlab Function Block
@Benjamin has shown you how to solve the equation using syms However, syms requires the MATLAB Interpreter, and so is only ava...

3 dagar ago | 0

| accepted

Answered
Symbols to numeric values
I already showed you X = double(sol.X) Y = double(sol.Y) Z = double(sol.Z) ... about 11 hours ago. To get that format of di...

3 dagar ago | 1

Answered
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...

3 dagar ago | 0

Answered
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...

3 dagar ago | 0

Answered
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...

3 dagar ago | 0

Answered
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...

3 dagar ago | 0

Answered
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)...

3 dagar ago | 0

Answered
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)))).*...

3 dagar ago | 0

Answered
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...

3 dagar ago | 0

Answered
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...

4 dagar ago | 0

Answered
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...

4 dagar ago | 0

Answered
Appending multiple Excel files using script
input_dir = '/MATLAB Drive/Project11/xin'; %directory excel files are stored in input_extension = '.xlsx'; %or .xls output_...

4 dagar ago | 1

| accepted

Answered
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...

4 dagar ago | 0

Answered
Why the audioread function is giving data samples in two coloum?
That indicates that the audio has two channels (stereo)

4 dagar ago | 0

| accepted

Answered
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...

5 dagar ago | 0

| accepted

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