# Index out of bounds in for cycle (MATLAB)

Ok, I'm having a problem (probably a newbie problem) but here it goes:

`for i=1:1:16; h=10^(-i); yDFC2(i)=(1/(2*1*h(i)))*(-1*valX+valX); end err2=abs(fDX(x1)-yDFC2); loglog(h,err2,'b-'); `

Every time I run this code, it gives me the following error:

Attempted to access h(2); index out of bounds because numel(h)=1

`valX` is a variable calculated by determining the image of a function that has been inputted by the user; `fDX` is the derivative of that function (both are working well).

This is meant to plot the spacing (`h`) vs the error in central finite differences (CFD). The formula inside the for cycle is the 1st order derivative calculated by CFD for `n=2`.

The spacing needs to be in increments of `10^(-i)`.

If anyone could help me figure this out, I'd be very thankful.

If you do

```h = 10.^(-(1:1:16)); ```

outside of the for loop, you can accress h(i) correctly inside. The problem is that you create a scalar h for each pass.

Category:matlab Views:1 Time:2011-11-29
Tags: matlab

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