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Representing data as surface

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Kaouthar Kaouthar
评论： Star Strider 2019-8-3
Hello, I am trying to plot a surface from my data (x,y,z). I have a collection of data with the following (X, Y, Z) triplets:
Capture.JPG
I have represented x, y and z in the form of matrix (as shown in my code below) and I have tried to represent the values of z with respect to x and y and that s what i have found as result:
jkj.JPG
The result is not correct, I wanted to have the 25 values of z represented each one in a specific color.
for example for x=1 and y=25, i want to have a colored surface that represent z= 0.192678 and the same thing for all the others.
(with stem3, it s ok, i have my 25 vertices but i want to obtain 25 colored surfaces)
This is my code and data:
close all
clear all
x=[1 1.02 1.06 1.08 1.1 ;1 1.02 1.06 1.08 1.1; 1 1.02 1.06 1.08 1.1;1 1.02 1.06 1.08 1.1;1 1.02 1.06 1.08 1.1];
y=[25 25 25 25 25; 28 28 28 28 28; 30 30 30 30 30; 35 35 35 35 35; 40 40 40 40 40];
z=[0.1926782273603 25.7666609559705 26.3758732322372 17.0874435713091 2.61780104712041;...
0.50550640909912 25.1708618103017 33.1627906976744 7.59717314487632 0.342836521111504 ;...
1.23900161608907 25.8307914593033 41.9949352841868 32.1646341463415 4.74541046068583 ;...
0.274630964641264 25.831399845321 49.0575458744227 20.4442361761949 22.8672566371681 ;...
2 28.1091559797196 33.3518005540166 18.3106367316894 24.7384937238494 ];
figure
% stem3(x,y,z)
surf(x,y,z)
% shading flat
colormap jet
Any help would be strongly appreciated.
Thank you in advance

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回答（1 个）

Star Strider
Star Strider 2019-8-3
See if adding
view(20, 20)
after your surf call does what you want.
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Kaouthar Kaouthar
Kaouthar Kaouthar 2019-8-3
I want to represent the corresponding z of each couple (x,y) by a surface in order to obtain a map containing the 25 values of z represented by surfaces at the end.
I strated by this link,(https://fr.mathworks.com/help/matlab/visualize/representing-a-matrix-as-a-surface.html) it gives how to plot what i want but with vertices (reshaping data in the link)
I want the same thing but with surfaces not vertices.
Thank you again!
Star Strider
Star Strider 2019-8-3
My pleasure.
THe surf plot creates a surface, so it does what you say you want.
I have no idea what you want, so:
Try this:
figure
surf(x,y,z)
view(20, 20)
shading('interp')
colormap jet
or this:
[X,Y] = meshgrid(1:0.01:1.1, 25:0.25:40);
Z = griddata(x, y, z, X, Y, 'cubic');
figure
surf(X, Y, Z)
view(20, 20)
shading('interp')
colormap jet
to see if those are what you want. Note that the second just interpolates to a finer grid, and uses a cubic interpolation function.

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