dominik

Istituto Universitario Europeo

Last seen: 6 maanden ago | Active since 2013

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How to apply functions to symmatrix objects, in the same way as to sym objects.
Hi I work with symbolic matrix objects, defined as symmatrix. Unfortunatly, symmatrix is not compatible with as many functions...

meer dan een jaar ago | 0 answers | 0

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Question

Operations and differentiation with symmatrix in MATLAB... possible bug?
Hi I have found matlab to behave unexpectedly when using the symmatrix. I dont understand it, maybe i misunderstood the way ope...

meer dan een jaar ago | 1 answer | 0

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answer

Question

MATLAB seems to use multiple cores and threads but not processors
Hi I have a computer with 2 processor, 10 cores each, 2 threads per core. When I run say a big matrix multiplication the win...

bijna 9 jaar ago | 0 answers | 0

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answers

Question

difference corr and autocorr
Hi why does ac1=corr(x(1:end-1),x(2:end)) not yield the same as ac2=autocorr(x); ac2(2) ? Many thanks!

meer dan 9 jaar ago | 0 answers | 0

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answers

Question

derivative of cubic spline for use in nonlinear optimization
Hi i wanna solve a functional system of nonlinear equations by collocation. To speed up the solution process i want to provi...

meer dan 10 jaar ago | 0 answers | 0

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Answered
bug in matlabFunction when passing unspecified symbolic function?
I still think it's a bug but as a workaround, one can define auxiliary variables syms Dfx Dfy Dfz and substitute them ...

meer dan 11 jaar ago | 0

Question

bug in matlabFunction when passing unspecified symbolic function?
Hi the function _matlabFunction_ seems to do a mistake with undefined functions. It seems to work all right if there is on...

meer dan 11 jaar ago | 1 answer | 0

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answer

Answered
General function in symbolic toolbox
Hi Thanks for the answer, it seems I havent expressed my question clearly. In what you propose you define the function explic...

meer dan 11 jaar ago | 0

Question

General function in symbolic toolbox
Is it possible in the matlab symbolic toolbox to define general functions, i.e. to define functions only as a general mapping fr...

meer dan 11 jaar ago | 3 answers | 1

3

answers

Question

constrained maximization, share variables of tagret function and constraint
I want maximize a function f(x) s.t. nonlinear cosntraints c(x). Both the function f(x) and c(x) contain a computation step g(x)...

bijna 12 jaar ago | 1 answer | 0

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answer

Question

getting slope information from griddedInterpolant
Hey when evaluating a griddedInterpolant, the computer should at some pont determine the slope of the interpolant at the query ...

bijna 12 jaar ago | 1 answer | 0

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answer

Question

nested loops in parfor, indexing
Hey im trying to solove an equation system over a 4 dimensional grid of parameter values. Since the difference between neigbo...

bijna 12 jaar ago | 1 answer | 0

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answer

Question

costly anonymous function declaration for solving a equation system with parameters
Hi i have to solve a equation system (which is a matlab functiion)for many parameters values, so i run a loop over the paramete...

bijna 12 jaar ago | 1 answer | 0

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answer

Answered
Large broadcast variable in parfor loop
I got it running.... but it seems this submission does only work for cells and matrixes. When I try to share a griddedInterpolan...

bijna 12 jaar ago | 0

Question

Large broadcast variable in parfor loop
Hi Im having a for loop that i want to parallelize. In the loop th essential part is an interpolation. The problem is that t...

bijna 12 jaar ago | 2 answers | 0

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answers

Question

Can querying "TriScatteredInterp" be as fast as "griddedInterpolant"?
Hi, im wondering why querying the TriScatteredInterpolant is so much slower and so much more size dependent than griddedInterpol...

meer dan 12 jaar ago | 1 answer | 0

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answer

Answered
cubic spline interpolation of a function that yields NaNs when evaluated at some of the grid points.
Update: I have above described the behavior of griddedinterpolant wrongly. I found that cubic interpolation is possible with...

meer dan 12 jaar ago | 0

Answered
cubic spline interpolation of a function that yields NaNs when evaluated at some of the grid points.
Thanks for ur tips! I thought about doing that (putting an arbitrary number in place of the NaNs), but was recluctant to do s...

meer dan 12 jaar ago | 0

Question

cubic spline interpolation of a function that yields NaNs when evaluated at some of the grid points.
Hi i want to cubic spline interpolate an unknown function defined over a 3 dimensional domain, whose values i know at the gridp...

meer dan 12 jaar ago | 3 answers | 0

3

answers

Answered
griddedInterpolant (via e.g. interp1) bug with NaNs?
Hey, I have the same problem: I define a griddedinterpolant IP over a grid G and the values V. whenever I evaluate IP at a gri...

meer dan 12 jaar ago | 0