Petter Stefansson

NMBU

Active since 2016

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How to show r square correlation and RMSE on a scatterplot
Given your x and y vectors, perhaps this is what you are looking for? plot(x, y, '*','displayname','Scatterplot') title('scatt...

meer dan 4 jaar ago | 4

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Matlab gets basic arithmetic completely wrong!
I just had a Matlab experience that made me question everything. I have two vectors: |v1| and |v2|. Both are of length 10 0...

meer dan 5 jaar ago | 1 answer | 0

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mexcuda not finding CUDA 9.0 even when I specify it via setenv('MW_NVCC_PATH',...)
I managed to solve the problem myself by editing the ‘nvcc_msvcpp2015.xml’ file and simply commenting out the line: <cmdRet...

bijna 6 jaar ago | 0

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mexcuda not finding CUDA 9.0 even when I specify it via setenv('MW_NVCC_PATH',...)
When I try to use mexcuda I get the error: Warning: Version 9.0 of the CUDA toolkit could not be found. If installed, set M...

bijna 6 jaar ago | 2 answers | 0

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Text/strings not working in Matlab 2018a
I recently upgraded to Matlab 9.4.0.813654 (R2018a) from R2017a (where everything was working fine), and now whenever I plot thi...

ongeveer 6 jaar ago | 1 answer | 0

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Unable to compile cuda code containing dynamic parallelism: Error: “ptxas fatal : Unresolved extern function 'cublasCreate_v2'”
I’m trying to create a simple mex function that calls cublas functions such as cublasDgemm from inside a kernel so I can utilize...

bijna 7 jaar ago | 2 answers | 0

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meer dan 7 jaar ago | 2 answers | 0

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Duplicating an mxArray without first storing it as a plhs?
I’m writing a MEX file in C where I need to duplicate an |mxArray| in the code. What I’m currently doing is this: plhs[0] =...

meer dan 7 jaar ago | 1 answer | 0

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Compiling CUDA files with mexcuda - why wont Matlab accept my compiler?!
Im trying to compile CUDA files into mex. Matlab ships with an example CUDA file located in |matlabfolder\toolbox\distcomp\g...

meer dan 7 jaar ago | 2 answers | 0

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Indexing a matrix with another matrix?
Hi. I have a |10000x4| matrix, |Idx|, where each row contains 4 indices to a logical matrix, |A|. I would like to set all ind...

meer dan 7 jaar ago | 1 answer | 0

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Multiply slices of a 4D array with vectors without nested loops? Is there a function comparable to pagefun for the CPU?
I want to multiply each 2D matrix slice of a 4D matrix, |X|, with a number of vectors, stored in Beta. If I was doing it on the ...

meer dan 7 jaar ago | 1 answer | 0

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How do I estimate the memory usage of a calculation on the GPU?
Hi. I have a parallel calculation that I’m doing on the GPU to speed up things compared to doing it on the CPU. However, the...

meer dan 7 jaar ago | 1 answer | 1

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Can I convert long binary strings into unique serial numbers of much shorter length?
I’m generating a very large number of long binary strings, for example: S1 = [0 0 1 1 0 0 0 0 0 0 1 0 1 1 0 0 0 …] S2 = ...

meer dan 7 jaar ago | 2 answers | 0

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How do I use the recursive dir function in release 2016b?
I’ve installed the pre-release version of matlab 2016b and one of the new features listed in the release notes is that the |dir|...

bijna 8 jaar ago | 0 answers | 0

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Getting the regression coefficients for a lower number of Partial Least Squares components than specified by plsregress(X,Y,ncomp) without redoing the whole regression model?
When performing a regression with the |plsregress| command in matlab, you specify the number of components when you fit the mode...

bijna 8 jaar ago | 0 answers | 0

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How do I sequentially partition the folds in cross validation?
I’m working on a partial least squares regression problem where I want to set up cross validation with a |cvpartition| object. H...

ongeveer 8 jaar ago | 1 answer | 1

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Advice on vertical edge detection on grayscale image with very weak contrast
I’ve taken a large quantity of X-ray images of wooden samples and in order perform the analysis I’m trying to do I need to extra...

ongeveer 8 jaar ago | 1 answer | 0

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Bug in Matlab/statistics toolbox or is there a typo in the plsregress example? (or something wrong with my Matlab installation?)
If others are running into the same problem, it seems to be solved by updating to matlab 2016a!

ongeveer 8 jaar ago | 0

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Bug in Matlab/statistics toolbox or is there a typo in the plsregress example? (or something wrong with my Matlab installation?)
I’m having problems with getting the partial least squares regression to work properly and I suspect that there either is someth...

ongeveer 8 jaar ago | 1 answer | 0

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Petter Stefansson

NMBU

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