Looking for Finite Element programs for beam structures

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2 total messages Started by Wu Changming Tue, 07 Apr 1992 19:30

#263

Author: Wu Changming
Date: Tue, 07 Apr 1992 19:30

14 lines
849 bytes

Hi:

I am trying to write a finite element program for beam structures using 
MATLAB. The beam structure has spring support boundary conditions. If 
someone has written such kind of programs and give me the code, I am 
very appreciated.

If the code is in Fortran or Pascal, it is also welcome.

Thanks in advance

Changming
wucm@gb.luth.se

In-situ 2-d non-square matrix transposition

#265

Author: Keith Slavin
Date: Thu, 09 Apr 1992 17:16

25 lines
1287 bytes

Does anyone have an algorithm for IN-SITU transposition of a 2-d NON-SQUARE
matrix stored in a linear address space:

source memory location = source width * i + j,

move data to:

destination memory location = source height * j + i

(note: source height = destination width)

without requiring allocation of extra memory - the matrix is large
and I don't have much memory left.

Speed is not too much of an issue. I have found simple coordinate
transformation sequences which work for certain values of width and height,
but in many cases, these transformations produce closed sequences which are
only a subset of the total coordinate space, and a search (analogous to a
sieve) is required to complete the process. The sieve requires extra memory.

Is it even possible in the general case?

Thanks,

Keith Slavin

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