Hi all, i try to use interp1 function. but i have two data input (Y), the values of the underlying function , one of them is a vector while the other is constant value. so how i can deal with Y
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yi = c(x,Y,xi)
1 Kommentar
Stephen23
am 20 Feb. 2016
What is c? Please show us what values you have, and how you want to use them.
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John D'Errico
am 20 Feb. 2016
Bearbeitet: John D'Errico
am 20 Feb. 2016
So, what you are telling us is, that you apparently have a "function" Y(x), such that for ANY point x, the value of the function Y(x) is Y, a constant. You wish to interpolate that "function"?
My question is, why bother? You already know the function is constant. So the simple answer is to use repmat, which will return the same constant value for every value of xi.
yi = repmat(Y,size(xi));
The only thing I am unsure about is what you intended by the code fragment:
yi = c(x,Y,xi)
This is what Stephen also referred to. I see that this call seems to be identical to the format interp1 uses. And you refer to interp1 in your question. Therefore, I assume that you are asking what function can be used to interpolate a constant function. Again, the answer is, no special function is required, perhaps beyond something trivial like repmat.
3 Kommentare
Jonathan Hawkins
am 12 Jun. 2017
As to "Why bother..." I've run into this problem when I'm writing code that needs to interpolate for a generic function, which can be constant.
It's incredibly irritating that interp1 throws an error if the function you're interpolating happens to be constant. That's just shoddy design on Mathworks' part if you ask me.
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