Data with NaN

Hi

I´m having trouble plotting data that include NaNs. I load a data-matrix using textread. I want to skip plotting entries that are NaNs.

For example:

x=[4 2 NaN 9]

y=[3 5 7 8]

Now I want to plot x against y for the 1st, 2nd and last entries (skipping the third). Are tips how to do this?

Answer 1

[Teja Muppirala]

If you wanted to keep a line connecting them:

I = ~isnan(x) & ~isnan(y);
plot(x(I),y(I))

[Hernan Larriva]

Thanks , regards from Barcelona!

Answer 2

[John D'Errico]

Have you bothered trying to plat the data? What did plot do when you did try it? For example,

plot(x,y,'o')

Try things in MATLAB! Don't just give up and assume it will fail! READ THE HELP! Look at the arguments.

Answer 3

[David Young]

Unless I've misunderstood your question,

plot(x,y,'o');

does exactly what you are asking.

[Vishnu Keyen]

I have 1*1000 array

I have values only in every 100th indice.

x=nan(1,1000);
x(1:100:end)=rand(1,10);
y = 1:1000;

it will plot the data when i say

plot(x,y,'o-')

But there won't be any line between the points.

I want to plot all the values, ignore the nans, and still get a line connected between them.

Answer 4

[Ola Kalen]

Thanks Teja, that solves my problem

Ola

[Teja Muppirala]

Sure, no problem. I assumed that's probably what you were trying to do.

It helps to be very thorough in writing in your question though. In other words don't just say you are "having trouble", but say what that trouble is ("the line connecting them disappears!").

Sometimes people have difficulty interpreting exactly what you wanted to ask, and then you are less likely to get the answer that you were looking for.