Index exceeds the number of array elements

Hello everyone, I need some help. I'm chemical engineering student (beginner in MatLAB) trying to find the composition distribution in each tray of an absorber column.

I'm trying to use for loop to repeat calculation from tray 2 to tray 21.

So, I write the for loop j = 2:21.

when I ran the code, I type Tg(5) in the command window to see the value solved (temperature in the 5th tray) but there's a message

Index exceeds the number of array elements (3).

what's wrong? I suspect it doesn't go looping as I command.

what am I supposed to do to get it fixed?

Thank you, have a good day!

ps: I attached my m-files

[Stephen23]

>> size(Tg)
ans =
   1   3

Why do you expect Tg to have (atleast) five elements?

None of your arrays have five elements in them, all of them have three or fewer elements.

[Bertiningrum Devi]

I see, I need help to overcome this problem.

Answer 1

[infinity]

Hello,

I have tried to run you code.

I regconized that after the loop j = 2 the "errorTL = 2.0201e-06" that is smaller then "tol = 1e-5". Therefore, condition "while errorTL >= tol" is violated. Thus, for j = 3, 4, 5, .... the value of Tg could not be updated.

You should check this agan.

[Bertiningrum Devi]

Ah I see. That helps so much :)