matlab - graph plotting

I have two arrays to plot, in x axis : array a. In y axis array b (ones and zeros开发者_如何转开发)

I want to plot vertical lines when the values of array b =1 i.e

a=[23 12 76 43 21 90]
b=[1 0 1 1 0 1]

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You may try bar plot.

a=[23 12 76 43 21 90];
b=[1 0 1 1 0 1];
bar(a,b)