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It's not clear, but it seems like x is a cell array containing strings. If you want to extract the year and the day then you mi...

1

Answered 4 years ago

It seems like you want to sort by the value of the second row. To do this you first find the order you want: [~,ind]=sort(A(...

This can be done by hand, but assuming this is a template for a more complicated problem, you would need to use Aeq and beq to h...

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We have a 580 GTX with 3Gb of ram running in a linux (Ubuntu Lucid with Natty backported kernel) machine with 2011b and I find m...

4 Answers

Asked 4 years ago

I found a rather kludgy way to get it to work by replacing most of the int's with mwSignedIndex's. So in addition to having to ...

4212 views

Responded 6 years ago

How did you get ndfun to work in 64 bits? I tried pointing mex to the blas and lapack libraries included in $MATLABROOT/bin/gln...

Any thoughts?

3548 views

Responded 7 years ago

I'm writing some code that will be used to convolve large amounts of data in a little time as possible (~1 million 1D ffts, each...

Posted 7 years ago

I am trying to do a 3D fft on some data using the built in GPU toolbox of 2011a and am having some trouble. Since the fftn func...

3 Answers

Asked 5 years ago

I am a bit confused now. I corrected a few unrelated bugs in the code (they multiplied the output of betacore) and the speed is...

2422 views

Hi Steve, Thanks for the quick response. My problem with betainc is that I have to evaulate it for 0<z<~3, -2<~w<=0 , and 0<x<...

I need an implementation of the incomplete beta function (Matlab implements the regularized version which fails for the argument...

Hi, I need to solve A*x=B for size(A)~[10,10,1e5] and size(B)~[10,1,1e5], and it seems like something like pagefun would be the...

2 Answers

Asked 2 years ago

I have been running GPU code on 480 and 580 GTX cards in R2011b for a while and I keep hitting memory fragmentation problems. E...

Hi, I need to do x=A\b several hundred million times, along with other trivial arithmetic, for an A that is 4x4 and dense. I wa...

1 Answers

Asked 3 years ago

Never mind. That transformation produces equally spaced abscissas, with equal weights and can't possibly be accurate.

1609 views

Responded 8 years ago

I am sorry, I realize this is not correct for regular Chebyshev, but is certainly correct for Chebyshev-Lobatto, which uses abci...

I am rather curious as to why quadgk uses a 7 point Gauss-Legendre basis for its Kronrod extension. Does the accuracy of the ca...

Posted 8 years ago

Hi, I just ran into a curious problem with R2015a'a GPU fftn function. For some reason fftn and ifftn refuse to transform 512x...

Asked 10 months ago

I am using complex step derivatives to compute gradients of an otherwise real and analytic function, but I get different answers...

I need to run some basic image analysis routines -- mainly Euclidean bwdist and dilate/erode type operations -- on massive quant...

I'd like to bump this ancient question, but now with a new twist: mex wrapper with OpenMP. I need to compute the convexhulls of...

Answered 9 days ago

second line should read: imread(strcat('C:\Users\ell\Desktop\segn\seg_array\', files(1).name));

Is there a way to have the derivativecheck option put out the full jacobian in the output? For some complicated functions, the ...

0 Answers

I don't have too much experience with GPU coding in Matlab, but I noticed something very odd. When I take a program written ent...

The reshape command works very fast. The .' operation needed to shift the dimensions not so much. The routine spends about 20% ...

Answered 5 years ago

If evaluating your integral is not too expensive, then why not compute the r-derivative of your integral and use Newton's method...

707 views

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