How to remove NaN's from an array AND the corresponding value/element in another array of the same size?

Question

Bijan Sanchez 2020-3-12

评论： dpb 2020-3-12

I have 2 arrays: A = [2 3 5 7 9] and B = [1 3 nan 1 nan]

I want to plot(A,B) but when i do that, i will just get data points and no line connecting each point bc there's NaN's between points

(i want lines between points bc i intend to show multiple data sets in this plot eventually)

so i want to remove the nan's in B and the corresponding elements in A (5 and 9)

to remove the nan's in B, i do:

y1 = B(~isnan(B));

so now, y1 = [1 3 1]

how do I make an x1 = [2 3 7]? so i can just plot (x1,y1)

I'm doing this many many times with a large set of data.

Answer 1

Alex Mcaulley 2020-3-12

x1 = A(~isnan(B));
y1 = B(~isnan(B));

Bijan Sanchez 2020-3-12

lol

dpb 2020-3-12

Perhaps easier to visualize (and might be a little faster at expense of a temporary variable) ...

isOK=isfinite(B);
plot(A(isOK),B(isOK))