McCabe-Thiele calculation problem

I am having problem to complete the Matlab code I have found available on Matlab, however the code gives problem at specific point, which I guess is not related to me.

I attached the document as well as the problem I am getting

Hope to hear from anyone that knows to the problem

In advance, thank you very much!

Answer 1

[Prabhan Purwar]

Hi,

Following error apparently occurs when variables are not being assigned a value, so they act as a symbol. Conditions upon symbolic variable (without any value assigned) is not supported, as in your case.

Thanks.

[Baris Kara]

Thanks