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Douglas Brenner


Active since 2016

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Answered
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.

más de 3 años 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 ...

más de 3 años ago | 3 answers | 0

3

answers

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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 =...

casi 4 años ago | 1 answer | 0

1

answer

Question


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;...

casi 4 años ago | 2 answers | 0

2

answers

Answered
help with fitlm (least squares fit)
I could try a Gaussian fit. That would work for me. Do you have an example for that? Thanks.

casi 4 años ago | 0

Answered
help with fitlm (least squares fit)
Your demo crashed it as well.

casi 4 años ago | 0

| accepted

Answered
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.

casi 4 años 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 ...

casi 4 años ago | 3 answers | 0

3

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Answered
Why 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.

casi 4 años 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...

casi 4 años ago | 3 answers | 0

3

answers

Answered
matrix multiplication dimension issues
Found the answer. n is not the number of points in a spectrum but the number of spectra. Thanks for trying

casi 4 años ago | 0

Answered
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...

casi 4 años 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...

casi 4 años ago | 3 answers | 0

3

answers

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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 - ...

casi 4 años ago | 1 answer | 0

1

answer

Question


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...

casi 4 años ago | 0 answers | 0

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Answered
reducing 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...

casi 4 años ago | 0

Answered
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(...

casi 4 años 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...

casi 4 años ago | 2 answers | 0

2

answers

Question


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...

casi 4 años ago | 1 answer | 0

1

answer

Answered
dimension 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 ...

alrededor de 4 años 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...

alrededor de 4 años ago | 3 answers | 0

3

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Answered
error 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...

alrededor de 4 años 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 ...

alrededor de 4 años ago | 1 answer | 0

1

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Answered
Getting non-existent pixel values
Didn't work Index exceeds matrix dimensions. Error in stddev (line 51) greenChannel = b(:, :, 2); Is there a green pla...

casi 6 años ago | 0

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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 ...

casi 6 años ago | 2 answers | 0

2

answers

Question


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...

casi 6 años ago | 0 answers | 0

0

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Question


using greythresh and im2bw
Figure 1 is great but BW is all black. Thoughts? Thanks figure (1) scaled = 255 * width/MAX; imshow(uint8(scal...

casi 6 años ago | 1 answer | 0

1

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Question


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...

casi 6 años ago | 2 answers | 0

2

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Answered
What does this error for hist mean?
Got it. hist.m is now myhist.m

casi 6 años ago | 0

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