can I adjusting one vector according to another vector for plotting?

Hi, I have this matrix for example like this:

Matrix M=

2 4 1 4 6

2 5 NaN 8 1

4 NaN 9 NaN NaN

9 6 NaN NaN 7

And vector T=

1

2

3

4

I am trying to plot vector T on the x-axis with every row column of matrix M on the y-axis. This works fine the plot aoutoatically ignore the points with NaN.

The problem is I would also like to use polyfit, to get a fitting equation. But Polyfit is does not skip NaN values, which gives only NaN as coefficients. Please note that I the matrix M is orignally a much larger matrix same as vector T is much larger. These are just examples for my point.

My question is is there a another way to get the equation of a fitted line fo every coumn vs vector T.

Example, the option in the graph tools> basic fitting works great, but this is manual. I need to output the fitting equations for large matriceis in a for loop and store them.

Answer 1

[Matt J]

Given x,y for fitting,

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

p=polyfit(x(I), y(I),1)

[Abdallah Magour]

Thank you Matt!, this worked perfectly!!