The size of X must match the size of Z or the number of columns of Z.

Hi there

I have a netcdf file I have running in MatLab. But I want to plot contour lines for the geostrophic wind. When I running my code i got the fail "The size of X must match the size of Z or the number of columns of Z." Someone there could help me?

if true
figure(2);   
clow=4680; chigh=6000; cint=60;      
conts = [clow:cint:chigh];           
V = [clow:cint*2:chigh];             
[c,h]=contour(lat,lon,z,conts,'linewidth',1.5,'color','k');
clabel(c,h,V);                      
quiver(latv,lonv,vg500,ug500)
title('Geopotential height and geostrophic wind at 500 hPa')
xlabel('longitude'), ylabel('latitude')

    figure(3)
clow=4680; chigh=6000; cint=60;   
conts = [clow:cint:chigh];        
V = [clow:cint*2:chigh];          
[c,h]=contour(lat,lon,z,conts,'linewidth',1,'color','k');
clabel(c,h,V);                  
pcolor(latv,lonv,Vg);
shading interp
colorbar('v');
title('geopotential height and magnitude of geostrophic wind at 500 hPa')
xlabel('longitude'), ylabel('latitude')
  end

[Walter Roberson]

Which line is producing the error? What are the sizes of each of the variables mentioned on that line?

It is common to confuse x and y on a matrix. X corresponds to columns not rows.

[Jonas Damsbo]

It's line

[c,h]=contour(lat,lon,z,conts,'linewidth',1.5,'color','k');

The sizes are:

 lat = 9865 x 1
lon = 360 x 1
z = 360 x 181 
conts = 1 x 23

[Walter Roberson]

Your lat variable is about 54 times too large. It would have to be 181 long for that z data.

Answer 1

[ANKUR KUMAR]

There are few mistakes I want to highlight. You have used,

contour(lat,lon,z.............

It should be

contour(lon,lat,z................

Moreover make sure that the third argument must be in the dimension of second input X dimension of first input.

Have a look over this example

contour([1:10],[1:15],rand(10,15))

You will get an error

Error using contour (line 48)
The size of X must match the size of Z or
the number of columns of Z.

It should be

contour([1:10],[1:15],rand(10,15)')

Always put lon as the first input and dimension of third should be second X first.

[Jonas Damsbo]

I got a output now, thanx!