MATLAB: Matrix Multiplication Error: I have a 1×4 and a 4×4 that I am attempting to multiply. Matlab is giving me an error stating “Inner matrix dimensions must agree”. C=[0;1;0;0]; A=[0 0 1 0; 0 0 0 1; -36 36 -3/5 3/5; 18 -18 3/10 -3/10]

MATLABMATLAB and Simulink Student Suitematrixmatrix manipulationmatrix multiplication

Matrix 1 is –> C=[0;1;0;0]; Matrix 2 is –> A=[0 0 1 0; 0 0 0 1; -36 36 -3/5 3/5; 18 -18 3/10 -3/10];

Best Answer

C is not 1x4 but 4x1, transpose it (C')

C'*A

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MATLAB: Reshape of multidimesion matrix to single dimension matrix.

C(:)

C(:).'

reshape(C, [], 1)

reshape(C, 1, [])

MATLAB: I have an array of data [ 1.1 0.5 1.8 2.5 0.6 2.0 2.1 4.0 1.3 1.4 5.0 4.2 2.2 3.2 3.4 3.5 3.3 4.8 1.11 2.0 2.5] I need a code pick data points incrementally from 1.1 until it get to the peak then start selecting after the peak in deceasing order.

V = [1.1 0.5,1.8,2.5,0.6,2.0,2.1,4.0,1.3,1.4,5.0,4.2,2.2,3.2,3.4,3.5,3.3,4.8,1.11,2.0,2.5];
[~,idx] = max(V);
N = V(1);
X = false(size(V));
for k = 1:idx
    X(k) = V(k)>=N;
    N = max(V(k),N);
end
for k = idx:numel(V)
    X(k) = V(k)<=N;
    N = min(V(k),N);
end
Z = V(X);

Generates this output vector:

>> Z
ans =
   1.1000   1.8000   2.5000   4.0000   5.0000   4.2000   2.2000   1.1100

Compared to the requested output:

>> [ 1.1 1.8 2.5 4.0 5.0 4.2 2.2 1.11]
ans =
   1.1000   1.8000   2.5000   4.0000   5.0000   4.2000   2.2000   1.1100

Best Answer

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MATLAB: Reshape of multidimesion matrix to single dimension matrix.

MATLAB: I have an array of data [ 1.1 0.5 1.8 2.5 0.6 2.0 2.1 4.0 1.3 1.4 5.0 4.2 2.2 3.2 3.4 3.5 3.3 4.8 1.11 2.0 2.5] I need a code pick data points incrementally from 1.1 until it get to the peak then start selecting after the peak in deceasing order.

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