Problem in display a figure

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ZC Song
ZC Song 2019-6-4
编辑： ZC Song 2019-6-13
Hi everyone,
Now I want to display a map using the App designer.
I have two questions, one is why I can't use the gray color in the colormap? I tried to change the color but doesn't work!
The other is why my figure is beyond the axis?
Below is the code and results:
A = [ans(:,1),ans(:,2),ans(:,3)];
clear ans
X_1 = A(:,1);
Y_1 = A(:,2);
Z_1 = A(:,3);
scatter(app.DEMview,X_1,Y_1,200,Z_1,'s','filled')
c = gray;
colormap(c)
colorbar(app.DEMview)
hold on
Thank you very much!

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