Re: [Matplotlib-users] Problem: Multiple plots with same variables plot incorrectly.

[Louis P. <pe...@an...>]

Christopher Barker wrote:
> Louis,
>
> This is standard num* array behavior: arrays are mutable, and MPL is 
> not making copies of them when you plot, which is a good thing.
>
> by the way, slices of arrays are references too, which is different 
> than python lists, so it can be surprising, but also useful
>
>>              # 1st Plot .................
>>        x[0]= 1.0
>>        y[0]= 1.0
>>        x[1]=-1.0
>>        y[1]=-1.0
>>        a.plot(x,y)
>>
>>        # 2nd Plot .................
>
> now you need copies. You can make brand new ones, or use the copy() 
> method:
> x = x.copy()
> y = y.copy()
>
> you could also pass a copy into the plot method:
>
> a.plot(x.copy(), y.copy())
>
> which is perhaps the behavior you were expecting.
>
> -Chris

Thanks, Chris.  I sort of figured this out, but you put it clearer and I 
like the copy suggestion.  I'll use it.  It sure drove me nuts for a 
while.  :-)

-- 
Cheers,

Lou Pecora

Code 6362
Naval Research Lab
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