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Accept 5 answers given by other contributors
Awarded to Douglas Brenner on 20 Jul 2017
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Matlab crashes but Octave doesn't
Give that man a cigar and thank you very much. pinv(A)*b work as I suspect doing the LU decomposition manually would.
meer dan 5 jaar ago | 0
Question
Matlab crashes but Octave doesn't
The program below runs in Octave but crashes Matlab 2014. Mathworks won't help because my contract has run out. Any ideas would ...
meer dan 5 jaar ago | 3 answers | 0
3
answersQuestion
creating a vector where each element needs to be calculated before hand
Can I creat Z in a single statement which doesn't require explicit calculation of each element or should I just use a loop? Z =...
meer dan 5 jaar ago | 1 answer | 0
1
answerQuestion
Creating a matrix one row at a time
In each iteration of a loop I create a row vector Y = [1,2,3,4,5]; then I want to add the Y's to a matrix one line at a time;...
meer dan 5 jaar ago | 2 answers | 0
2
answershelp with fitlm (least squares fit)
I could try a Gaussian fit. That would work for me. Do you have an example for that? Thanks.
meer dan 5 jaar ago | 0
help with fitlm (least squares fit)
Your demo crashed it as well.
meer dan 5 jaar ago | 0
| accepted
help with fitlm (least squares fit)
X = [1,2,3,4,5] Y = [1,5,6,4,2] yFit = polyfit(X,Y, 2) Matlab itself crashed.
meer dan 5 jaar ago | 0
Question
help with fitlm (least squares fit)
I don't understand how to use fitlm if indeed that's the right function to use. I want to fit 5 sets of data to the function y ...
meer dan 5 jaar ago | 3 answers | 0
3
answersWhy would circshift stop working.
I had been transposing matrics and released this morning as I was waking that this must have been the problem. Thanks.
meer dan 5 jaar ago | 0
Question
Why would circshift stop working.
There is no evidence that circshift is working. The two plots are the same whereas yesterday a clear shift in the plots can be s...
meer dan 5 jaar ago | 3 answers | 0
3
answersmatrix multiplication dimension issues
Found the answer. n is not the number of points in a spectrum but the number of spectra. Thanks for trying
meer dan 5 jaar ago | 0
matrix multiplication dimension issues
The basic science is to take two spectra and perform a 2d cross correlation resulting in a real and a complex matrix. They shoul...
meer dan 5 jaar ago | 0
Question
matrix multiplication dimension issues
I have an article which I'm trying to follow. It calculates two matricies that I called synch and async. I read two files into...
meer dan 5 jaar ago | 3 answers | 0
3
answersQuestion
Replacing for loops with matrix math.
How can I simplify this code. I.e remove the loops and replace them with matrix math. for i=1:3 for j = i:num_pts - ...
meer dan 5 jaar ago | 1 answer | 0
1
answerQuestion
Getting off diagonals after calculating a correlation matrix
The code below gives the first off diagonals of the correlation computation in line 6. How do I get the others? testm1 = [1...
meer dan 5 jaar ago | 0 answers | 0
0
answersreducing number of operations in matrix multiplication
Clearly but that was the suggested solution. Trying for i=1:2 diags1{i} = testm(i+1:num_pts-i-1 ,2).*testm(1:num_pts-i-1,2...
meer dan 5 jaar ago | 0
reducing number of operations in matrix multiplication
testm = [1,2,3,4,5;2,4,5,7,10] num_pts = 5; testm = transpose(testm) corr = testm(:,2)*testm(:,2)' diag(...
meer dan 5 jaar ago | 0
Question
reducing number of operations in matrix multiplication
I want to perform the follow operation: synch = spect1(1:num_pts ,2)*spect2(1:num_pts,2)'; The problem is that num_pts > 300,0...
meer dan 5 jaar ago | 2 answers | 0
2
answersQuestion
I want to do a least squares fit to the values around a matrix diagonal including the diagonal itself.
Suggestions?
meer dan 5 jaar ago | 1 answer | 0
1
answerQuestion
Why does this loops produce a matrix?
code waves = [393.029, 414.386, 427.176, 516.748, 526.953, 640.000]; l = length(waves); for i = 1:l L = wave...
meer dan 5 jaar ago | 1 answer | 0
1
answerdimension error with * operator
The paper from which I got the code uses * and that works in this line: synch = C1(:)*C1(:)'/(delta-2). Not only do I not get ...
meer dan 5 jaar ago | 0
Question
dimension error with * operator
This line of code: asynch = C1(:)*N(:)*C(:)'/(delta-2) throws an error: Error using * Inner matrix dimensions must agree. Th...
meer dan 5 jaar ago | 3 answers | 0
3
answerserror trying to run xcorr2.
This is the error: Cell contents reference from a non-cell array object. Error in cell2mat (line 42) But if I try a different...
meer dan 5 jaar ago | 0
Question
error trying to run xcorr2.
This is my code D1 = cell2mat(data1{2}); %D1 and D2 are 1x3 cells of doubles D2 = cell2mat(data2{2}); c = xcorr2(D1,D2); It ...
meer dan 5 jaar ago | 1 answer | 0
1
answerGetting non-existent pixel values
Didn't work Index exceeds matrix dimensions. Error in stddev (line 51) greenChannel = b(:, :, 2); Is there a green pla...
meer dan 7 jaar ago | 0
Question
Getting non-existent pixel values
After the following code, an image is displayed. It is black, white and red. However, if I use hpimpixelinfo(2) on the image I ...
meer dan 7 jaar ago | 2 answers | 0
2
answersQuestion
image processing algorithm for filling
I am going to try but in the meantime if anybody wants to help ... I have a 2-D image in black, white and red. Going across e...
meer dan 7 jaar ago | 0 answers | 0
0
answersQuestion
using greythresh and im2bw
Figure 1 is great but BW is all black. Thoughts? Thanks figure (1) scaled = 255 * width/MAX; imshow(uint8(scal...
meer dan 7 jaar ago | 1 answer | 0
1
answerQuestion
What does this error for hist mean?
Attempt to execute SCRIPT hist as a function: /Users/douglasbrenner/Documents/MATLAB/hist.m Error in extractedge (line 3...
meer dan 7 jaar ago | 2 answers | 0
2
answers
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