How can I create the following vector??

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OSCAR ZAMORA PICAZO
评论： Guillaume 2016-5-19
I have a vector called "y", which is for plotting values in the y axis. Also, I have a variable which is a scalar number, but I want to create a vector with the number of places of "y", but having all values of this vector the same value of that variable.
As an example: y = 0:0.5:3;
r = 30
r' = [30 30 30 30 30 30]
The thing is that my vector "y" is much longer than that.
So, how can I create the vector called "r'"?

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回答（1 个）

Adam
Adam 2016-5-19
编辑：Adam 2016-5-19
r = repmat( 30, [numel(y), 1] );
or
r = 30 * ones( numel(y), 1 );
or
r = 30 + zeros( numel(y), 1 ) );
I haven't tested which is more efficient.

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