I want vector surface plot

Hello,

I have three vectors: Prices:1X30, Position:1X30 and Quantity:1X30 and I want to do the surface plot. I get the following error:

"Z must be a matrix, not a scalar or vector."

Your help is important.

[KSSV]

As Prices, Position, Quantity are three vectors, you cannot have a surface plot. You need to have one matrix of size 30x30 to have a surface plot.

[stelios loizidis]

Do you think it's right to do the 30x30 matrix with these three vectors?

Answer 1

[KSSV]

Prices = 1:30 ; 
Position = 1:30 ; 
Quantity = rand(1,30) ;
Quantity = repmat(Quantity,30,1) ;
surf(Prices,Position,Quantity)

Answer 2

[Star Strider]

I am not certain what result you want.

Try this —

Prices = rand(1,30);                                                % Use Actual Vector
Position = rand(1,30);                                              % Use Actual Vector
Quantity = rand(1,30);                                              % Use Actual Vector

Prv = linspace(min(Prices), max(Prices), numel(Prices));
Psv = linspace(min(Position), max(Position), numel(Position));
[Pr,Ps] = ndgrid(Prv,Psv);
 Qt = griddata(Prices(:),Position(:),Quantity(:),Pr,Ps);
 
 figure
 surfc(Pr, Ps, Qt)
 grid on
 xlabel('Prices')
 ylabel('Position')
 zlabel('Quantity')

.