Contour plotting from given datapoints

I have certain values of L and corresponding to each L value there is a value of R and Q respectively

How to contour plot them

on X axix we should have Q, on Y axix R and contours of L.

Values are

L1 = 26

R = 16 ;17 ; 19 ;25 ;26 ; 27 ; 30 ; 31 ; 32

Q = 9.74 ; 11.047 ; 13.88 ;24.45 ; 26.49 ; 28.56 ; 35.44 ; 37.88 ; 40.41

L2 = 28

R = 15;16;17;19;21;22;29;30;31

Q = 7.82 ; 8.9492 ; 10.16 ;12.78 ; 15.7 ; 17.28 ; 30.55 ; 32.74 ; 34.94

Answer 1

[Bala Tripura Bodapati]

Hi Paras

It is my understanding that you would like to know how to create a contour plot based on the data provided for X-axis, Y-axis, and Z-values.

The X, Y and Z values must be in the form of a matrix for creating a contour plot. The following code illustrates how to create a contour plot for the data provided:

R = [16 ;17 ; 19 ;25  ;26 ;  27 ; 30 ; 31 ; 32]' 
Q = [9.74  ; 11.047 ;  13.88  ;24.45 ; 26.49 ;  28.56 ;  35.44 ; 37.88 ;  40.41]'
R = [R;[15;16;17;19;21;22;29;30;31]']
Q = [Q;[ 7.82 ;  8.9492 ;  10.16  ;12.78 ;  15.7 ;  17.28 ;  30.55 ;  32.74 ;  34.94]']
L1 = 26.*ones(9,1)'
L2 = 28.*ones(9,1)'
Z = [L1;L2]
contour(Q,R,Z)

Please refer the contour documentation for more information.