How to use Kronecker Delta?

[MarianoC]

I want to create a matrix using a little program with Kronecker Delta (1 if i=j, 0 if not) however it does not work.

Where is the mistake?

Thanks!

[terryhendicott]

Hi,

You do not need to increase "j" it happens automatically,

You have return statement for D in the first for loop not outside it.

[MarianoC]

Ok, but the Kronecker delta is well used?

Look:

[terryhendicott]

Hi,

The return of D needs to be outside of the for loops

You can use identity matrix for Kronecker Delta

Please attach your worksheet to clarify your problem.

You may have to zip it first. A serious bug in this forum often prevents from attaching a mathcad file. In Windows Explorer click with the right-mouse button on the mathcad file and select 'Send to' -> 'Compressed (zipped) folder'. The resulting .zip file can be attached

[MarianoC]

Well, I will use the identity matrix as a substitute for the Kronecker Delta.

Thanks

[terryhendicott]

Hi,

Stress has units of MPa.  D is dimensionless.  Cheers

[terryhendicott]

Hi,

Stress you have defined looks like it needs units of MPa,

This will make D dimensionless.

[LucMeekes · Accepted solution]

Kronecker delta is a function in Mathcad/Prime, so it needs to be called with parameters 'delta(i,j)'  rather than with indices 'delta[i,j'.

I can't open your sheet (unrar produces an error message), but I should guess that Prime's error message is that delta is undefined...?

Success!

Luc

[Werner_E]

Just to summarize what Luc and Terry already have written:

[terryhendicott]

Hi,

You do not need to program it, just use matrix manipulation will do in one step

[MarianoC]

Could you convert it to Prime 3.0 or lower?

Thanks!

[terryhendicott]

Hi,

You cannot use Prime 4.0 to save back to Prime 3.0.

Have enclosed a JPEG snapshot of screen.

[LucMeekes]

If you have both applications open on the same PC , you can copy equations from a sheet opened in prime 4 an paste them to a sheet opened in prime 3.1. Don't know if this works for versions below 3.1.

Success!
Luc