How to randomly add variance in a graph plot

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Krish Desai 2015-9-28

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评论： Walter Roberson 2015-9-28

I'm graphing y=x, but I want to add a second plot of black stars where y is randomly + or - 0.25 I know the code to plot is

plot (x,y2, 'k*')

but how do I randomly add noise to create y2?

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Star Strider 2015-9-28

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编辑：Star Strider 2015-9-28

Experiment with the randn and rand functions to get the result you want.

But don't I need to do use the rand function each time then? So for x=1 I would have to use rand(2) and have 1 correspond with .25 and 2 with -.25. But then I would have to do this 10 more times. I want to make it more efficient. Would I be able to create a new vector and add this to y2?