bug in the function

What do I need to write in f2 (u1, u2) so that I do not have the error :

Undefined function or variable 'ETA'.

Answer 1

[Cris LaPierre]

What is ETA?

You cannot use a variable you have not defined. Perhaps you think this variable is loaded by data.mat, but apparently not.

[Image Analyst]

Or else, you need to pass ETA into f2(). f2 is not going to magically know what ETA is unless you tell it.

[yonatan friedman]

ETA=1, but if i type it in the " targil.m " so it show me the error, but if i type ETA=1 in f2(u1,u2) its not show me the error- ( Undefined function or variable 'ETA'. )

• ETA could be 2 ,too

[Cris LaPierre]

https://www.mathworks.com/help/matlab/ref/function.html

[Image Analyst]

Please attach data.mat and all m-files that are needed to run your code. I'll check back later.

[yonatan friedman]

sorry for the delay,

now i always get the error:

Array indices must be positive integers or logical values.

[Cris LaPierre]

The problem is when your for loop counter is 7, the value of d in f4 is a single number. However, in computing ETA, you use d(end-1). Since there is only a single value, end-1=0, which causes the error that you see.

[Cris LaPierre]

These types of errors are difficult if not impossible to spot by just inspecting your code. The best way to track down the issue is to learn how to use the debugger.