I am new to SMATH as a previous post indicated. I really need help with programming.

Here is a program I wrote several years ago. It takes almost 20 seconds to run. Scroll down to the section with the nested for-loops in the program. It is a program for coupled finite difference equations.
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When I was working on this, someone on the forum modified the code as follows so that it runs instantly. I cannot find the difference because I pasted in from this program its nested for-loops to the above one and got no improvement in runtime. What is the difference?
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I am trying to get this much simpler program to run. It seems to be in an endless loop. At least it hasn't finished after several minutes. In Mathcad 15 it runs instantly. I tried to copy the syntax from the above program. Where am I going wrong?
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Thank you for any help you can give.
Reg Curry

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Thank you for any help you can give.

You can make it piece wise ... first.
Cheers ... Jean.

System of Equations (1).sm (32 KiB) downloaded 21 time(s).

Wrote

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SMath isn't very fast. Sometimes works putting some eval() function or choosing Optimization / Numeric, but not always.

Wrote

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The difference is that in the first length(t) = 160 and 15 in the second.

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if you start the loop from j = 1, then S[j-1] is S[0], and SMath have only ORIGIN = 1.

Best regards.
Alvaro

... Project REG Unk.sm (12 KiB) downloaded 26 time(s).

Thanks

Origin = 1 was the problem. It’s hard not to let MATHCAD affect my syntax.