# Matrix to Surf Incorrect

조회 수: 5(최근 30일)
Sclay748 2020년 10월 28일
편집: Swetha Polemoni 2020년 11월 2일
Hello, I have a 4x3 matrix. When I use the surf function, it does not plot properly. I want:
• X Axis = 1st Column
• Y Axis = 2nd Column
• Z Axis = 3rd Column
Attached is a screenshot of the code and what shows up.
Thank you!

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### 답변(1개)

Swetha Polemoni 2020년 11월 2일
편집: Swetha Polemoni 2020년 11월 2일
Hi,
As per my understanding you want these following points to be plotted.
(x,y,z)=> (15,50,0.1576549),(25,20,0.1581748),(25,50,0.157905),(25,80,0.157428).
• Understanding the working of "surf".
For a given matrix A, surf(A) will plot A(i,j) at i on x-axis and j on y axis where i and j are row and column number respectively.
Consider the following example for better understanding
Let A=[a,b;c,d]
surf(A) will surface plot the element b of matrix A at (1,1) as x and y coordinates.
X=[15 50 0.1576549; 25 20 0.1581748; 25 50 0.157905; 25 80 0.157428 ]
According to the above explanation, surf(X) will surface plot
the following points (1,1,15),(2,1,25),(1,2,50) etc. As per my understanding, surf will not work for your application.
• Undersatnding the working of "plot3"
(x,y,z)=> (15,50,0.1576549),(25,20,0.1581748),(25,50,0.157905),(25,80,0.157428)
For plotting these points "plot3" can be used.
Following code snippet is for better understanding.
X=[15 50 0.1576549; 25 20 0.1581748; 25 50 0.157905; 25 80 0.157428 ]
plot3(X(:,1),X(:,2),X(:,3))

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R2020a

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