# contour plot problem Z must be at least a 2x2 matrix

조회 수: 2 (최근 30일)
Jialin Men 2024년 7월 25일
댓글: Star Strider 2024년 7월 25일
Hallo everyone,
i have a problem to make the contour plot, it always shows Z must be at least a 2x2 matrix. i have try my best to solve, but it still not work, could you please to help me? The code is as follows.
x=[80;100;90;90;90]
x = 5x1
80 100 90 90 90
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
y=[4;4;2;6;4]
y = 5x1
4 4 2 6 4
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
[X,Y] = meshgrid(x,y)
X = 5x5
80 100 90 90 90 80 100 90 90 90 80 100 90 90 90 80 100 90 90 90 80 100 90 90 90
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
Y = 5x5
4 4 4 4 4 4 4 4 4 4 2 2 2 2 2 6 6 6 6 6 4 4 4 4 4
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
% Polly 11 f(x,y)=p00+p10*x+p01*y
f1=1.7419-0.0006*x+0.0132*y
f1 = 5x1
1.7467 1.7347 1.7143 1.7671 1.7407
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
contour(X,Y,f1)
Error using contour (line 48)
Z must be at least a 2x2 matrix.
Thanks and best regards
JL

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### 채택된 답변

Star Strider 2024년 7월 25일
Anotther option, using the scatteredInterpolant function —
x=[80;100;90;90;90]
x = 5x1
80 100 90 90 90
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
y=[4;4;2;6;4]
y = 5x1
4 4 2 6 4
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
[X,Y] = meshgrid(x,y);
X = 5x5
80 100 90 90 90 80 100 90 90 90 80 100 90 90 90 80 100 90 90 90 80 100 90 90 90
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
Y = 5x5
4 4 4 4 4 4 4 4 4 4 2 2 2 2 2 6 6 6 6 6 4 4 4 4 4
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
% Polly 11 f(x,y)=p00+p10*x+p01*y
f1=1.7419-0.0006*x+0.0132*y
f1 = 5x1
1.7467 1.7347 1.7143 1.7671 1.7407
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
Fz = scatteredInterpolant(x, y, f1)
Fz =
scatteredInterpolant with properties: Points: [5x2 double] Values: [5x1 double] Method: 'linear' ExtrapolationMethod: 'linear'
F1 = Fz(X,Y)
F1 = 5x5
1.7467 1.7347 1.7407 1.7407 1.7407 1.7467 1.7347 1.7407 1.7407 1.7407 1.7203 1.7083 1.7143 1.7143 1.7143 1.7731 1.7611 1.7671 1.7671 1.7671 1.7467 1.7347 1.7407 1.7407 1.7407
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
contour(X,Y,F1)
.
##### 댓글 수: 4이전 댓글 2개 표시이전 댓글 2개 숨기기
Jialin Men 2024년 7월 25일
Hallo Star,
That is so kind of you. It helps me really a lot. :)
Actually what I want is to see How f1 changes with x and y, or how it distributed with different x and y by contour plot, i thought the contour plot will be like the pictures i sent it you, however it is not.
Thanks so much again for your help. That is really important to me. If i have questions i may contact to you again.
Best regards
JL
Star Strider 2024년 7월 25일
As always, my pleasure!

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### 추가 답변 (1개)

Walter Roberson 2024년 7월 25일
x=[80;100;90;90;90];
y=[4;4;2;6;4];
[X,Y] = meshgrid(x,y);
% Polly 11 f(x,y)=p00+p10*x+p01*y
f1=1.7419-0.0006*X+0.0132*Y;
contour(X,Y,f1)
##### 댓글 수: 4이전 댓글 2개 표시이전 댓글 2개 숨기기
Walter Roberson 2024년 7월 25일
Your plot is similar to what you would get if you used surfc
Jialin Men 2024년 7월 25일
Hallo Walter,
Thank you so much.
I should be have been more careful. i will use the surfc to check.
Thanks again.
JL

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