Identidying next "n" elements of an array

I am working on a coastline evolution model. What I would like to do is identify the element(s) in my water depth array that satisfy a certain condition. For instance find(h<.90 & h>0.89). I would then like to identify the next "n" values in my "y" (coastline height) array that have values greater than the located element(s)and set all of their values equal to the y value of the array elements where the find(h<.90 & h>0.89) condition was met. Hopefully this makes sense. I'll try and sum it up...

I HAVE:

ymax = 20 ymin = 200 y = ymin:0.02:ymax x = (y+20)/0.02

Sealevel = (very long array)

h = y-Sealevel

I WANT:

Inds = find(h<.90 & h>0.89)

%then take that element(s) location and find it in my y array, take the next "n" elements in the y array and make their value the same value of the y value of "Inds" element

I am not sure how to deal with Inds returning multiple elements. Ideally I would just like it to find the first elements that satisfies the condition.

Answer 1

[Sara]

To find just the first element that meets your condition, you can do:

Inds = find(h<.90 & h>0.89,1);

then:

h(Inds+1:min(Inds+n,numel(h))) = h(Inds);

[James]

Thank you for your answer, Sara. Can you explain to me what the second line you have written is doing? I think that I want to be:

y(Inds+1:min(Inds+n,numel(h))) = y(Inds);

If I am not mistaken. This will then identify the next n elements in my y array and set them to the value of y(Inds), correct? I am not sure what nume1(h) is.

Thanks

[Sara]

For instance: inds = 45; n = 10; but you have only 50 elements in y. To avoid having problems, you have to limit the max value of inds+n to the number of elements of the y array (i.e., numel(y)) as:

y(Inds+1:min(Inds+n,numel(y))) = y(Inds);

[James]

Great. Thank you.

[José-Luis]

Please accept an answer if it helped you.