how to change grid option(size of grid & granularity)

i have this mask.and display that by meshc function?

z=[  0.0000  0.0000  0.0000  0.0000  0.0000 0.0000;
  -0.0005 -0.0001  0.0000  0.0000  0.0000 0.0000;
   0.0038  0.0001 -0.0005 -0.0000  0.0000 0.0000;
   0.0074  0.0066  0.0027 -0.0003  0.0000 0.0000;
   0.0054  0.0067  0.0078  0.0011 -0.0001 0.0000;
   0.0000  0.0000  0.0000  0.0000  0.0000 0.0000];
meshc(z)

how to change grid option like this image :

Answer 1

[Star Strider]

Since you have gridded data, the interp2 function is perfect for what you want to do.

EDIT — To illustrate (literally):

og = [1:6];                                                     % Original Grid (Vector)
[X,Y] = meshgrid(og);                                           % Original Grid (Matrices)

qg = linspace(min(og), max(og), 25);                            % Query Grid (Vector)
[Xq,Yq] = meshgrid(qg);                                         % Query Grid (Matrices)
zq = interp2(X,Y,z,Xq,Yq, 'spline');                            % Interpolated ‘z’

figure(1)
meshc(Xq, Yq, zq)
grid on

Explore the options (grid size, interpolation method, etc.) presented in the interp2 documentation.

[fred bnm]

very thanks

[Star Strider]

My pleasure.

[Image Analyst]

fred, you can also "Thank" him by "Accepting his answer to give him reputation points.

[fred bnm]

what is 6 and 25 ?

[fred bnm]

@star strider how to set parameter for matrix [15*16] ?

[Star Strider]

First — The ‘6’ in the original ‘x’ vector was used to create the (6x6) [X,Y] matrices necessary to provide an original independent variable reference for interp2, since ‘z’ is (6x6). The ‘25’ is simply the arbitrary length of the vector I used to create the [Xq,Yq] ‘query’ matrices for interp2. Any length will work, providing it produces a readable plot.

Second — If you want the interpolation matrices to be (15x16), create vectors to use in meshgrid to produce the appropriate ‘query’ matrices.

Third — Thank you, Image Analyst!

The code to produce a (15x16) interpolated grid:

og = [1:6];                                                     % Original Grid (Vector)
[X,Y] = meshgrid(og);                                           % Original Grid (Matrices)

qgx = linspace(min(og), max(og), 16);                           % Query Grid (X-Vector) (1x16)
qgy = linspace(min(og), max(og), 15);                           % Query Grid (Y-Vector) (1x15)
[Xq,Yq] = meshgrid(qgx, qgy);                                   % Query Grid (Matrices) (15x16)
zq = interp2(X,Y,z,Xq,Yq, 'spline');                            % Interpolated ‘z’

figure(1)
meshc(Xq, Yq, zq)
grid on

You can change the ‘qgx’ (query grid x) vector and ‘qgy’ vector to be anything you want. Experiment with other options available in the interp2 function.