Unable to use curly braces to index into cell

Anybody know how to fix this?

Answer 1

[Fangjun Jiang]

Where is your variable "cell" defined? cell() is a function. Use some other name.

[ROBERT WALSH]

Should I replace all instances of cell with a different variable name?

[Stephen23]

"Should I replace all instances of cell with a different variable name?"

Yes, because cell is the name of an important function (which you should not shadow).

You should also preallocate the cell array before the loop:

https://www.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html

[ROBERT WALSH]

I replaced cell with Group1 and I get the following:

[Rik]

Read the second part of Stephen's comment.

[Stephen23]

Note that preallocation will improve efficiency, it will not fix bugs in your code's logic (e.g. trying to access data that does not exist, like you are apparently attempting). That error message tells us that that IF statement was never run. Trying to access the third column of an array that was never added to the cell array in the first place... is not going to work (even if you preallocate the cell array).

[Fangjun Jiang]

The problem is that in the first for-loop, the "if" condition was never met so variable "Group1" was never created.

For problem like this, puase the code before the line where the error occured and debug.

[ROBERT WALSH]

Sorry, I've been given this code for an assignment (I have little knowledge with MATLAB), could anybody get this to run and show the graph below given the following files?