MATLAB: Substract array elements based on other arrays

array

Hi,

I have three arrays.

The first one contain all numbrs that need to be studied, All = [1,2,3,4,5,6,7,8,9,10]

The other arrays contains the numbers that need to be retained, R1 = [8,9,10], R2 = [5]

I want the result to be (All – R1 – R2) which is equal to [1,2,3,4,6,7].

Your help is highly appreicated

Best Answer

setdiff(All,union(R1,R2))

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MATLAB: Solve system of large linear symbolic equations

On my system, Maple ran out of memory trying to solve() that equation. There is a possibility that a system with more memory might be able to arrive at an answer, given enough time.

Solving the entire system of 12 equations when they are each this large, would take a lot of time and memory.

I would recommend following John's advice to simplify the system.

MATLAB: Substract nd array slices

Does your code perform this:

dim = 3;
A   = rand(2,3,4,5);
A   = A(:, :, 2, :) - A(:, :, 1, :)

? Then:

function A = substract_page(A, dim)
C1      = repmat({':'}, 1, ndims(A));
C2      = C1;
C1{dim} = 1;
C2{dim} = 2;
A       = A(C2{:}) - A(C1{:});
end

Best Answer

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MATLAB: Solve system of large linear symbolic equations

MATLAB: Substract nd array slices

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