countour plot based on temperature value

I have x, y values. and I have a temperature for each point. I want to draw a counter line based on these temperature values. how can I do it?

contour (xq, yq, vq); %size of matrix:xq (247x1) yq (247x1) vq (247x1)

When I use it, I get the following error.

Error using contour (line 48)

Z must be at least a 2x2 matrix.

Answer 1

[Adam Danz]

This example in the documentation shows how to set up the contour() inputs.

For the syntax contour(x,y,z), z is your mxn temperature matrix. x is your 1xn (or nx1) latitude values, y is your 1xm (or mx1) longitude values. Note now the n's and m's pair between those inputs.

Alternatively, x and y can also be mxn matrices with the lat and lon values for each value of z.

Here's a demo to show the shape of inputs.

contour(1:10, 1:20, rand(20,10))
axis equal

[Fego Etese]

Hello Adam Danz, please i really need your help on this question, i can't seem to wrap my head around it.

https://www.mathworks.com/matlabcentral/answers/545180-how-to-calculate-the-angle-between-two-lines-from-the-same-origin

I will really appreciate your help,

Thanks