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Manually interpolate a 2D array

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Hello,
Basically I have a question on how to manually interpolate a 2D array:
Let's say I have a 80 x 100 array and want to make it into 100 x 120. I want to increase the size of my array, and interpolate the values of the initial array.
Can anyone help me with this matter?
Thanks alot

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Accepted Answer

Andrei Bobrov
Andrei Bobrov on 25 Nov 2019
a = rand(4,8);% Let a - your array
F = griddedInterpolant(a);
[i,j] = ndgrid(linspace(1,4,10),linspace(1,8,12)); % grid for new array 10 x 12
out = F(i,j); % new array

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Angelina Papathanasiou
Angelina Papathanasiou on 25 Nov 2019
I had the same question but I have the constraint that I cannot use complex commands (griddedInterpolant(), ndgrid()). Is there a way of receiving the same answer without them?
1.Can I use meshgrid() instead of ndgrid()? Is there a simple way to do the same without gridderInterpolant(), using "first pricinples"?

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