Problem with subscript in thermodynamic problem

[Rikii]

Good night.
I'm using mathcad prime 3.0. I try to solve a problem as stated in my textbook "Introduction to Thermodynamics in Chemical Engineering" Smith & Van Ness but I define the variables that tell me or how to resolve the situation subscript "i, j" which are integers. If anyone can help me I appreciate fully. Attached the document.


thanks

 

[rmix22]

You made four different errors in your sheet:
[ol 1]
[li]Your range variables are going from 1 to 3, but Prime numbers vector elements beginning with the value of the system variable ORIGIN - in your case from 0 to 2[/li]
[li]You define vectors (3x1 matrices) at the top of your sheet and later you try to use these vectors to create a 3x3 matrix with the same name! You can't use the same name for two different structures at the same time.[/li]
[li]You used the literal index (CTRL + -) where you should have used the vector/matrix index ([). You can't address vector elements with an literal index as this is just part of the variables name.[/li]
[li]In the definition of the matrices Vc and Pc you forgot the indices on the LHS of the definition[/li]
[/ol]
Furthermore I noticed that the vector Pc you define at the top is never used in your sheet but is overwritten later by the definition of a matrix Pc. Not sure if that was done on purpose.

Find attached a sheet which fixes all those errors and makes use of range variables independent of the value of ORIGIN. I deleted your global definition of ORIGIN as the default value is 0 anyway and I renamed you various vectors at the top by adding an underline so we don't get into troubles by defining the matrices with the same value.

 

[Rikii]

Thank you very much for the correction, had not noticed that kind of features in mathcad. Thanks for your time and corredigo document.