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plot and ignore certain values

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David C
David C 2012-4-24
评论： Samuel Bartlett 2018-5-14
I have a vector I need to plot that contains numerics gathered from a data acquisition board collecting at 1 hz (1 point / sec).
any time signal is lost, a placeholder "-1" value is used in that cell and I need to plot this vector but not have it plot the "-1"s
is the plot function capable of such a task? or do I have to remove all the "-1"s first?
  1 个评论
Nathaniel Menefee
Nathaniel Menefee 2017-3-10
So i want to do that same thing but i want to do it with 2 different plots. is there any way to do this.

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采纳的回答

Wayne King
Wayne King 2012-4-25
You can set those values to NaN
x(x == -1) = NaN;
plot(x)
They will show up as gaps in your plot.
  2 个评论
David C
David C 2012-4-25
bingo, logical indexing saves the day! Thanks Wayne!
Samuel Bartlett
Samuel Bartlett 2018-5-14
THANK YOU SO MUCH!!! This saved my life!

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更多回答（1 个）

Wayne King
Wayne King 2012-4-24
You can just plot x for x~= -1 or did you mean that the character array "-1" is entered? Not sure what you mean by the " ".
x = randi([-1 4],20,1);
plot(x(x~= -1))
  1 个评论
David C
David C 2012-4-24
almost did the trick
your code stitched the gaps together for the areas where -1 was present, but I would like for it to leave the gaps present!
Thank you!

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