while cycle with functions

crashkeeper · Feb 13, 2008

Hi, i would like to do a while cycle with functions inside. i have tried but seems that mathcad dont like functions inside.
what i want to do is augment a matrix i times like this:

Code:

A(x)=|  f(x)  0   |    <- this is a matrix with a function
     |  0    f(x) |

i want my while cycle to augment N(x) matrix with A(x) to result in this:

Code:

N(x)=|  f(x)  0     f(x)   0 ... |    
     |  0    f(x)    0     f(x)..|

so the cycle i have made is:

Code:

A(x):= | f(x)    0  |
       |  0     f(x)|
i:=0
N(x):= while i<3
         A(x) <- augment(A(x),N(x))
         i:=i+1

N(x)-> doenst calculate. it takes lot of time and nothin

Can you please help me in this problem?
thanks

PNachtwey · Feb 13, 2008

I would remove the recursive call. That is why your computer hangs up.

Code:

A(x):= | f(x)    0  |
       |  0     f(x)|
i:=0
N(x):= while i<3
                               vvv  Recursive call  
         A(x) <- augment(A(x),N(x))
         i:=i+1

I didn't think you could increment a global variable "i" from inside the subroutine. Just local variables.

crashkeeper · Feb 13, 2008

but i need that call N(x) to augment the matrix.
that means that i want to enlarge matrix A(x) with N(x) from the left to the right.
If i remove N(x) i cant augment the matrix.

i can do it manually, with no while cycle and i can do it too with a while cycle without functions. if i use constants instead of functions that routine works.

about the increasing variable i, i have it inside the routine, that is a mistake.

Thanks anyway

philipoakley · Feb 20, 2008

post the sheet on the collab

http://collab.mathsoft.com/~Mathcad2000

to get a better response.
P.

bbrnx19 · Feb 20, 2008

try this program

|i<-0 ->
|M<-N(x)
|while i<3
| |i<-1+1
| |M<-augment(A(x),M)

ChrMeissner · Feb 21, 2008

Hello,

see the following image:

(german "erweitern" = engl. "augment")

The MathCAD sheet is avaible at:

http://home.arcor.de/Chr_Meissner/Public/Forum/Forum_engtips_Matrix.xmcd

Christian

philipoakley · Mar 3, 2008

I think you will need to use the symbolic capability if you want to grow the functional form.

I'm sure it can be done. there are some examples such as Tom Gutman's Hessian, Ravel, etc. utilities on the

http://collab.mathsoft.com/~Mathcad2000

forum.

The live symbolic can be called within a programme!

Philip

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while cycle with functions

crashkeeper

Structural

PNachtwey

Electrical

crashkeeper

Structural

philipoakley

Aerospace

bbrnx19

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ChrMeissner

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philipoakley

Aerospace

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