Ho to do

hi

I have an array of 50 data points as 1X50. I want to find out 3 points prior to the maximum value in the array.

eg: the maximum value is on 27th position I want solution that will return the 24th position in the array

how to do it

thanx in advance

[Robert Cumming]

what have you tried?

[Jan]

You have posted the same question in CSSM. Rossposting confuses the people, who want to help you.

Answer 1

[Jan]

Have you read the help text of MAX?

x = rand(1, 50);
[maxValue, maxIndex] = max(x);
maxIndexMinus3 = maxIndex - 3;

Most likely this might cause troubles if the first element is the maximum. So perhaps you want this:

maxIndexMinus3 = max(1, maxIndex - 3);

[Sukumar Palo]

hi jan

but i want to write a function that can return the described point before the max point is reached.

thanx

[Robert Cumming]

you still need to find where the max is. Jan has given you the answer - have you tried it?

[Jan]

What exactly are the inputs of your problem? Do you know the index of the maximum initially? Then use just the last line I've posted. If you don't now the index of the maximum, the function has to find it of course.