CODEWITHSUNDEEP
matlabmatrixinterpolationindexing
emper
emper

Reputation: 401

Interpolation between components of a Matrix in MATLAB

In a project that I am doing I need to reach floating indexed elements of a matrix. That is to say for instance I want to reach the (16.25,1) th element of a matrix. That might seem odd at the first glance. However, by (16.25,1), I mean the interpolation between (16,1) and (17,1) with weights of .25 and .75 respectively.

Is there a built-in function for that?

Many thanks, Safak

Upvotes: 1

Views: 1963

Answers (2)

mathematical.coffee
mathematical.coffee

Reputation: 56905

You can use interp2:

Z = randi(10,10); % 10 x 10 random matrix with integers from 1 to 10
Z(1:2,1:2)
%ans =
%   2   4
%   7   6

% use interp2 to interpolate at row 1.5, col 2
z = interp2(Z,1.5,2)
% z = 6.5000

Upvotes: 2

anon
anon

Reputation:

You can use 2-D interpolation:

ZI = interp2(Z,XI,YI) assumes that X = 1:n and Y = 1:m, where [m,n] = size(Z)

where Z is your matrix, and XI & YI are your fractional indices.

Upvotes: 1

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