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dominik


Istituto Universitario Europeo

Last seen: 4 months 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...

8 months ago | 0 answers | 0

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answers

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...

8 months ago | 1 answer | 0

1

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...

8 years ago | 0 answers | 0

0

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!

8 years 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...

9 years ago | 0 answers | 0

0

answers

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 ...

10 years 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...

10 years ago | 1 answer | 0

1

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...

10 years 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...

10 years 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)...

11 years ago | 1 answer | 0

1

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 ...

11 years ago | 1 answer | 0

1

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...

11 years ago | 1 answer | 0

1

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...

11 years ago | 1 answer | 0

1

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...

11 years 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...

11 years ago | 2 answers | 0

2

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...

11 years ago | 1 answer | 0

1

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...

11 years 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...

11 years 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...

11 years 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...

11 years ago | 0