want ideas for contour, z is not a function for x,y

I'm begginer this.

I want draw a gragh using "contour".

I know the way of this is contour(x,y,Z) at help.

here, Z is function for x,y.

is it only this rule?

I want use this with Z is constant.

for example,

 x   y     z
 1   .2   10
 2   .3   11
 3   .4   12
 4   .5   13
 5   .6   14

as you can see, Z is not a function for x,y, constant.

Can I draw that using contour(or contourc, contourf... series of contour)?

How to ~ plz~

Answer 1

[Walter Roberson]

Z does not need to be related to x and y. For example,

x = sort(rand(1,10));
y = sort(rand(1,15));
z = rand(15,10);
contour(x, y, z);

[Walter Roberson]

If the problem is that your Z is not a grid, then you need to use griddata() or scatteredinterpolant or triscatteredinterp

Answer 2

[Thorsten]

Yes. Just use

contour(X,Y,Z)

[Byungsoo Yoo]

I want contour style. isn't anyone?

[Thorsten]

Sorry, I do not get what you want. Please provide some more details.

[Byungsoo Yoo]

Z is function at contour(x,y,z)

If z type is constant, don't use the graph of contour type ?

I denote, use contour code(contour,contourc,contourf ...) with constant Z for drawing contour type graph.

[Walter Roberson]

No, Z is a variable that has shape length(y) by length(x). Z is not a function! You can assign arbitrary values to Z, like in my example where I showed how you could use rand().

x = 1 : 5;
y = 0.1 : .1 : .5;
z = [1 2 3 1 3; 4 7 1 4 8; -3 -3 -3 11 2; 0 12 5 5 5; 9 8 7 3 3];   %SEE, a CONSTANT
contour(x, y, z)

There is no requirement that z be calculated at all.

[Saif Aleslam Abh]

I was wondering if Z is Matrix 1*1. How can I draw it

[Walter Roberson]

Saif, are your x and y something larger than 1 x 1? Is your Z intended to be the same for all of the locations? Or do you only have a single point? If you only have a single point then what do you expect the contour plot to look like?

[Saurabh Das]

Walter, what if my X, Y and Z matrices are 1x900. Why can't I plot a contour for it?

[Walter Roberson]

See https://www.mathworks.com/matlabcentral/answers/438293-plotting-contours-of-z-on-an-x-y-axis-where-z-is-not-a-function-of-x-or-y#comment_922832