Matlab command for generating random rational numbers between -1 and 0?

2014 8 18
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更新时间：2014 8 19
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Adam
Adam 2014-8-18

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-rand

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sara
sara 2014-8-18
if I am using "for loop" and for that I want to generate numbers that are in ascending order between [-1 0] then after half of my iterations I want to go back from 0 to -1 then what will be it's command?
Adam
Adam 2014-8-18
a = -rand( 100, 1 );
a( 1:50 ) = sort( a( 1:50 ), 'ascend' );
a( 51:100 ) = sort( a( 51:100 ), 'descend' );
Something like that would do the job. I don't know if you need to use a for loop for other purposes, but if you don't then you can just create all your random numbers upfront like that and then sort them.
If you have to create them in a for loop then just assign them to a (preferably pre-sized) array in the for loop and then sort as above after the end of the for loop. 'ascend' is default sorting behaviour so you can omit that flag, I just included it for clarity.
sara
sara 2014-8-18
Have you any idea of Yalmip?I stuck in that from 2 months and much worried
Johan Löfberg
Johan Löfberg 2014-8-19
What does YALMIP have to do with this question? Post your YALMIP questions on https://groups.google.com/forum/?fromgroups=#!forum/yalmip

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Ben11
Ben11 2014-8-18
编辑：Ben11 2014-8-18

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Like this?
a = -1;
b = 0;
r = a+(b-a)*rand(1,1)
If you want many of them change the inputs to rand. And if you want the fractional representation, use rats(r).

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