How to plot a Matrix?

I need to use this data to plot a 3D graph.

 G=   0.2520    1.5600   16.3764
    0.2880    1.4400  -44.7900
    0.3600    0.9600  -40.2200
    0.3240    1.0800  -59.6300
    0.3600    1.5600   44.5400
    0.2880    0.8400   41.8400
    0.2880    0.9600   36.4000
    0.2880    1.0800   32.6300
    0.2880    1.2000   30.8600
    0.2000    0.1320   29.2600
    0.2880    1.5600   26.9500
    0.2880    1.6800   26.6700
    0.2520    0.9600   21.2100
    0.2520    0.8400   29.5100
    0.2520    1.0800    4.5800
    0.2520    1.2000   25.5700
    0.2520    1.3200   20.4770
    0.2520    1.4400   16.7613
    0.2520    1.5600   16.4656
    0.2520    1.6800   18.0860
    0.3240    0.8400   19.9200
    0.3240    0.9600   34.8300
    0.3240    1.0800   42.8000
    0.3240    1.2000   40.2500
    0.3240    1.3200   38.8000
    0.3240    1.4400   37.9700
    0.3240    1.5600   37.5800
    0.3240    1.6800   37.4500
    0.3600    0.8400   30.5400
    0.3600    0.9600   23.3500
    0.3600    1.0800    0.0400
    0.3600    1.2000   42.0200
    0.3600    1.3200   46.1500
    0.3600    1.4400   45.1500
    0.3600    1.5600   44.5000
    0.3600    1.6800   44.1500
    0.3960    0.8400   30.3200
    0.3960    0.9600   37.2700
    0.3960    1.0800   28.0700
    0.3960    1.2000    8.0170
    0.3960    1.3200    4.4500
    0.3960    1.4400   19.5600
    0.3960    1.5600   37.0700
    0.3960    1.6800   45.8700
    0.4320    0.8400   30.7000
    0.4320    0.9600   33.2700
    0.4320    1.0800   38.1800
    0.4320    1.2000   65.7500
    0.4320    1.3200   26.0300
    0.4320    1.4400    0.0900
    0.4320    1.5600   31.1000
    0.4320    5.6800   14.3590
    0.4680    0.8400   31.3100
    0.4680    0.9600   31.7800
    0.4680    1.0800   20.7600
    0.4680    1.2000   40.2800
    0.4680    1.3200   35.5400
    0.6800    1.4400   32.4600
    0.4680    1.5600   29.1900
    0.4680    1.6800   23.8200
    0.5040    0.8400   31.8400
    0.5040    0.9600   31.6700
    0.5040    1.0800   31.5300
    0.5040    1.2000   42.9300
    0.5040    1.3200   42.7900
    0.5040    1.4400   38.9000
    0.5040    1.5600   36.4700
    0.5040    1.6800   34.6600

Answer 1

[Azzi Abdelmalek]

plot3(G(:,1),G(:,2),G(:,3))

[Helen]

Thank you! How do I turn this plot into a 'map' or a 'surface'?

[Azzi Abdelmalek]

There are missing data, I don't know if you can interpolate with interp2 function

Answer 2

[Markus]

use the meshgrid, griddata, surf:

    [xi yi]= meshgrid(min(G):0.05:max(G),min(G):0.05:max(G);
    zi = griddata(x,y,z, xi,yi,'linear');

    surf(xi,yi,zi)

i hope, i have no typo in it.

[Helen]

It say that x,y and z are undefined, how do I solve this? There is probably something really obvious I am missing!

[Markus]

this should work:

[xG yG]= meshgrid(min(G):0.05:max(G),min(G):0.05:max(G));
zG=griddata(G(:,1),G(:,2),G(:,3),xG,yG);
surf(xG,yG,zG)

or:

[xG yG]= meshgrid(G(:,1),G(:,2));
zG=griddata(G(:,1),G(:,2),G(:,3),xG,yG);
surf(xG,yG,zG)

this does make only sense as long as the data are xy koordinates with a z value.