Matrices and indexing ?!

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Ahmed Yassin
Ahmed Yassin 2020-2-11
编辑： James Tursa 2020-2-11
I have two variables with the same set of values Lx= (5,7,9,11,13,15) Ly=(5,7,9,11,13,15) and I want to tell Matlab to choose the combinations of Lx and Ly under the condition Lx/Ly =< 2 eg: 5*5 , 7*5, 7*7, 9*5, 9*7, 9*9 and so on, What should be written ? I don’t want it to multiply both numbers just a combination as they are to be used as inputs for the following steps
  2 个评论
James Tursa
James Tursa 2020-2-11
What does "Lx/Ly = 2" mean? Your example doesn't seem to fit.
Ahmed Yassin
Ahmed Yassin 2020-2-11
Sorry, It’s a typo I meant less than or equal 2

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回答（1 个）

James Tursa
James Tursa 2020-2-11
编辑：James Tursa 2020-2-11
[LX,LY] = ndgrid(Lx,Ly);
z = LX(:)./LY(:) <= 2;
LX = LX(z);
LY = LY(z);
LX and LY contain the number pairs that match the condition.

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