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Index must be a positive integer or logical.

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Shashank
Shashank 2012-10-27
I am getting the following error while running the code:
Attempted to access R1_rk4(17501); index must be a positive integer or logical.
Here's a part of my code where the problem lies:
ie1 = 1 + 0.000035/h1;
R1_te = R1_rk4(ie1);
e_R1 = abs(R1_te - R3_te);
Btw, R1_rk4 is a vector, not a matrix. h1 is a constant (time step in the problem). I am trying to access a specific element of the vector R1_rk4 whose size is (1 x 80000).
Any help in removing the error would be much appreciated.

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2012-10-27
编辑：Azzi Abdelmalek 2012-10-27
The problem is in
R1_te = R1_rk4(ie1);
what is the value of ie1
ie1 must be a positive integer or logical.
  1 个评论
Shashank
Shashank 2012-10-27
Thanks Azzi. I found out the mistake. The term 0.000035/h1 although turns out to be 17501 when calculating analytically but numerically it will not be an exact integer and that's enough for the indexing routine to complain about it being non-integral.

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更多回答（2 个）

Image Analyst
Image Analyst 2012-10-27
What's the value of ie1? Is it an integer? Maybe you want
integerIndex = max([1 round(ie1)]);
R1_te = R1_rk4(integerIndex);
  1 个评论
Shashank
Shashank 2012-10-27
Thanks Image Analyst. I basically need to round off the index to the next possible integer value.

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Walter Roberson
Walter Roberson 2012-10-27
  1 个评论
Shashank
Shashank 2012-10-27
Thanks for the link, Walter. I'll check the wiki section before asking a question here.

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