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Petter Stefansson


NMBU

19 total contributions since 2016

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Answered
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...

2 months ago | 1

| accepted

Question


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...

1 year ago | 1 answer | 0

1

answer

Answered
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...

1 year ago | 0

| accepted

Question


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...

1 year ago | 2 answers | 0

2

answers

Question


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...

1 year ago | 1 answer | 0

1

answer

Question


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...

2 years ago | 2 answers | 0

2

answers

Question


MEX function with CUDA code works once. Then I need to restart Matlab or recompile it!?
I’ve written a |MEX| file that uses the |CUDA| solver, specifically the |cusolverDnDgesvd| function, to compute the equivalent o...

3 years ago | 1 answer | 0

1

answer

Question


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] =...

3 years ago | 1 answer | 0

1

answer

Question


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...

3 years ago | 2 answers | 0

2

answers

Question


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...

3 years ago | 1 answer | 0

1

answer

Question


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 ...

3 years ago | 1 answer | 0

1

answer

Question


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...

3 years ago | 1 answer | 1

1

answer

Question


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 = ...

3 years ago | 2 answers | 0

2

answers

Question


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|...

3 years ago | 0 answers | 0

0

answers

Question


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...

3 years ago | 0 answers | 0

0

answers

Question


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...

3 years ago | 1 answer | 1

1

answer

Question


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...

3 years ago | 1 answer | 0

1

answer

Answered
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!

3 years ago | 0

| accepted

Question


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...

3 years ago | 1 answer | 0

1

answer