Z must be at least a 2x2 matrix

x=min(xbm):250:max(xbm);
y=min(ybm):250:max(ybm);
[X,Y]=meshgrid(x,y);

T=scatteredInterpolant(xbm,ybm,ResG,'natural'); 
plot(xbm,ybm,'ok','MarkerSize',1,'MarkerFaceColor','k');
hold on;
contour(X,Y,T(X,Y),10,'ShowText','on','LineWidth',2);

Error using contour (line 48)
Z must be at least a 2x2 matrix.

why??????

Answer 1

[Adam Danz]

In this line below from your code, T(X,Y) must be at lease a 2x2 matrix and it apparently is not.

contour(X,Y,T(X,Y),10,'ShowText','on','LineWidth',2);

From the documentation,

    contour(X,Y,Z) draws a contour plot of Z using vertices from the
    mesh defined by X and Y. X and Y can be vectors or matrices.

If you need more help troubleshooting, please provide the values for the missing variables in your question so we can run your code.

[Rendrick Lopes]

T = 

  scatteredInterpolant with properties:

                 Points: [34×2 double]
                 Values: [34×1 double]
                 Method: 'natural'
    ExtrapolationMethod: 'linear'

>> xbm

xbm =

   32.6136
   32.8462
   32.8095
   32.8786
   32.9559
   33.0200
   33.2711
   33.5576
   34.0248
   34.2545
   34.4672
   34.7595
   35.0323
   32.9965
   33.6407
   34.0138
   34.0272
   34.0382
   34.0232
   33.0078
   33.2779
   33.3520
   33.3626
   33.2215
   33.1824
   33.6091
   34.2363
   34.4644
   32.4334
   32.7207
   32.8809
   33.7854
   32.8745
   32.9229

>> ybm

ybm =

   41.7863
   41.7730
   41.7446
   41.7291
   41.7190
   41.6963
   41.6634
   41.6613
   41.6440
   41.6118
   41.5970
   41.5866
   41.5851
   41.7963
   41.7866
   41.7649
   41.7066
   41.6813
   41.6631
   41.7526
   41.7448
   41.7366
   41.7190
   41.7107
   41.7006
   41.7253
   41.7253
   41.7372
   41.6932
   41.6831
   41.6763
   41.6840
   41.8113
   41.6618

>> ResG

ResG =

    18
   -10
    47
    48
    -9
     6
   -16
    55
   -15
     8
   -16
    -6
    19
     7
   -23
   -10
    34
    19
    -1
    10
    19
    23
    59
    49
    50
    -8
    -3
     2
    64
    51
    33
    18
    37
   -13

I also have a txt file; do you need that too?

[Adam Danz]

Have you looked into any of this code?

The min and max values of xbm are 32.433 and 35.032. So what do you expect to come out of these lines below?

x=min(xbm):250:max(xbm);
y=min(ybm):250:max(ybm);

[Rendrick Lopes]

I solved the problem. I had multiplied xbm and ybm by 1E-3. XD

Now it work.

Thank you so much for your help.

[Adam Danz]

Great! It's always a good idea to look at the values of the variables to make sure they appear as you expect them to.