How to do this in MATLAB without for loops

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S. David
S. David 2012-3-12
Hi,
I have 4 vectors x1, x2, x3, and x4 all of size N-by-1. I need to select two vectors such that their minimum values are the maximum among all. How can I do that in MATLAB without using for loops?
Thanks

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回答（2 个）

Daniel Shub
Daniel Shub 2012-3-12
What about using an Nx4 matrix (or a cell array) instead of x1, x2, ...
In general x1, x2, ... naming is a bad idea:
http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F
Andrei Bobrov
Andrei Bobrov 2012-3-12
EDIT
n = 4;
a = eval(['[',sprintf('x%d,',1:n),']']);
[~,idx] = sort(min(a),'descend');
out = a(:,idx(1:2))
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Andrei Bobrov
Andrei Bobrov 2012-3-13
Hi Jan! Corrected for general (any) case, when n > 4.
Jan
Jan 2012-3-13
There is even no general case of x1, x2, x3, ... as long as Matlab cannot handle x_inf.
I think I should publish a Mex function "Unpoof('x', a, b)", which concatenates the contents of the variables x<a> to x<b> to the variable x and use the ASSIGNIN equivalent to put x into the caller workspace.

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