3D plot of a matrix

I have constructed a 2D matrix A for Temperature as a function of position ( 1 dimensional ) & time, I want to plot a surface for Temperature( z -axis ) with x & y being position and time .

e.g : A = [ 200 300 400 500; 400 500 800 1000; 1200 1500 1600 2000] . 3 rows = 3 time steps (1 sec,2 sec, 3sec) , 4 cols = 4 position. here we have 4 points, where the temp. for the 1st point is 200 at (t=1), 400 at (t=2) , 1200 at (t=3).

I want a surface plot for the values of temperature, which is saved in the matrix. Thanks

Answer 1

[KSSV]

   A = [ 200 300 400 500; 400 500 800 1000; 1200 1500 1600 2000] ;
   t = [1 2 3] ;
   pos = [100 200 400 1200] ;

   pcolor(t,pos,A')

[Anshuman S]

I have 10,000 time steps, is there any command for generating a matrix starting from 1 to n ( say 10,000 ) with a difference of 1 in each value like [ 1 2 3 4 5 ...... 9999 10,000 ] ?

[KSSV]

iwant = 1:10000 ;

[Anshuman S]

The surface created using surf (t,pos,A) looks very dark . How to get color contrast in it ?

[KSSV]

shading interp

after the plot.

Answer 2

[Paridhi Yadav]

You can do it like this, since you have not given position I have assumed (1, 2, 3, 4) to be the position.

     A = [ 200 300 400 500; 400 500 800 1000; 1200 1500 1600 2000] 
     p = [1 2 3 4] ;
     t = [1 2 3] ;
     surface(p,t,A)

Answer 3

[Aakash Deep]

Hello Anshuman,

You can just use the surf command for this. It will take care of your axis and color contrast itself.

   A = [ 200 300 400 500; 400 500 800 1000; 1200 1500 1600 2000] ;
   surf(A)

In this case, as the matrix is of dimension 3x4 only, so the plot will also have it's x-axis and y-axis with scale 3 and 4 but when you will create your vector of 10,000 timestamps, so I am supposing that your matrix will also have some similar dimension. So, it will do it by itself.