# I want vector surface plot

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stelios loizidis on 30 May 2022
Answered: Star Strider on 30 May 2022
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."
KSSV on 30 May 2022
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 on 30 May 2022
Do you think it's right to do the 30x30 matrix with these three vectors?

KSSV on 30 May 2022
Prices = 1:30 ;
Position = 1:30 ;
Quantity = rand(1,30) ;
Quantity = repmat(Quantity,30,1) ;
surf(Prices,Position,Quantity)

Star Strider on 30 May 2022
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')
.