How to plot 2 surfaces in a same chart?

2021 5 20
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更新时间：2021 5 20
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I need to plot 2 surface in a same chart, but facing errors when plotting the first surface itself. So yet to try how to plot 2 surface in the same chart.
I am trying to plot a surface as below:
a=readtable(file.csv);
X=a(:,1);
Y=a(:,2);
Z=a(:,3);
surf(X,Y,Z)
I am facing the below errors:
Error using tabular/length (line 212)
Undefined function 'LENGTH' for input arguments of type 'table'. Use the HEIGHT,
WIDTH, or SIZE functions instead.
Error in surf (line 60)
hasParentArg = strncmpi(args{i}, 'parent', length(args{i}));
Error in Plot_forces (line 7)
surf(X,Y,Z)
Please guide me as I am new to matlab.

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Sulaymon Eshkabilov
编辑：Sulaymon Eshkabilov 2021-5-20

0 个投票

% To create a surface you need 2D data for Z
a=readtable(file.csv);
X=a(:,1);
Y=a(:,2);
[x, y] = meshgrid(X, Y);
Z = .... % some f(x, y) math expression
% OR
z= meshgrid(Z);
surf(x,y,z)

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Hello sir, I have a table of 1000 rows with X,Y,Z & X1,Y1,Z2 columns. Will I be able to create to create surface plot with the Z, Z1 data in my table?
Yes, you can by using meshgrid().
a = readtable('file.csv');
X = a(:,1);
Y = a(:,2);
Z = a(:,3);
[x,y] = meshgrid(X,Y);
Z = meshgrid(Z);
surf(x,y,z)
Still facing some error sir:
Error using meshgrid (line 59)
Subscripting into a table using one subscript (as in t(i)) or three or more
subscripts (as in t(i,j,k)) is not supported. Always specify a row subscript and a
variable subscript, as in t(rows,vars).
Error in Plot_forces (line 7)
[x,y] = meshgrid(X,Y);
Sulaymon Eshkabilov
编辑：Sulaymon Eshkabilov 2021-5-20
Note that while importing your data from *.csv, your imported data will be in a table variable format and thus, you'd need to convert it into matrix format. Therefore, you should use the conversion first:
X = table2array(a(:,1));
Y = table2array(a(:,2));
Z = table2array(a(:,3));
%%
[x,y] = meshgrid(X',Y');
z = meshgrid(Z');
surf(x,y,z)
One more thing,note that Z and z are not the same variable names.
In your case, it make more sense to plot your 3 data arrays using plot3(X, Y, Z)
Good luck.

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