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Mathcad summations help

Mathcad summations help

Mathcad summations help

(OP)
I am sort of a novice with Mathcad and I am trying to solve a problem using an indexed summation.  I have from i=1 to N and N=2 (for now) but of the two terms indexed over i, one is a number and the second is a variable that I would like to be able to graph over.  I do not know how to do this, can someone help?

Thanks in advance
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RE: Mathcad summations help

It appears that there is more to the worksheet than is shown. It's better if you upload the file, not an image.

RE: Mathcad summations help

(OP)
I unfortunately cannot upload the entire file as it is quite large and there are confidentiality issues.  I was hoping this was a simple fix, maybe it is not.  Thanks though.   

RE: Mathcad summations help

Offhand, I don't see anything wrong with your summations.  t.2 and sigma(hf) are undefined because hf is undefined.  sigma(hf) appears to be a single value, so how does it get graphed?  If hf is defined as an array (like 1...5), then you have a problem because t.2 will be an array and the function sigmat(hf) will be an array and a function cannot be an array.  Mixing arrays and functions is a difficulty in Mathcad.  You'd be better to define everything as vectors instead of functions of hf.
 

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