converting 3 arrays into matrix

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Ahmed Abdulla
Ahmed Abdulla on 8 Jul 2019
Answered: Steven Lord on 10 Jul 2019
i have 3 different arrays x,y and z and i would like to create one matrix M where the M(i,j)=z(i) and i and j in M are the corresponding x and y values.
Note that x and y are not whole numbers
  1 Comment
Jon
Jon on 8 Jul 2019
I'm sorry, but I am having difficulty understanding your verbal description of your problem. Please provide a simple example with arrays x,y,and z and the matrix M that you would like to produce.

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Accepted Answer

Steven Lord
Steven Lord on 10 Jul 2019
You can't have an array in MATLAB whose element indices are non-integer values. If M is a matrix M(3.5, pi) will error (for example.)
What are you planning to do with this "matrix" M? You may need/want to create an object that will allow you to interpolate your data, like a scatteredInterpolant or griddedInterpolant.
If you don't want to perform interpolation but want to be able to map non-integer values to a value you could create a matrix like Adam Danz suggested and use ismember or ismembertol with the 'rows' flag when you need to "index" into that matrix with the non-integer values.

More Answers (1)

Adam Danz
Adam Danz on 9 Jul 2019
Edited: Adam Danz on 10 Jul 2019
It sounds like you want to horizontally concatenate three column vectors of equal length to form a matrix. If this doesn't demonstrate your question and its solution, please provide an example of the inputs and expected outputs.
x = randi(100,12,1);
y = randi(50, 12,1);
z = randi(15, 12,1);
M = [x,y,z];

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