Plotting 4dimentional data error

Question

james 2012-3-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/32263-plotting-4dimentional-data-error

采纳的回答： james

Hi all I'm trying to plot the data to see the global minimum point. I'm presented with the equation

C = (1.10471.*((Z).^2)*((X).^2))+(0.0481*(Y*Z)*14*X);

my first issue is that when I try to produce a plot of this I get the error

??? Error using ==> mtimes Inputs must be 2-D, or at least one input must be scalar.

Error in ==> Untitled4 at 5 C = (1.10471.*((Z).^2)*((X).^2))+(0.0481*(Y*Z)*14*X);

My code is x = -10:1:10; y = -10:1:10; z = -10:1:10; [X,Y,Z] = meshgrid(x,y,z); C = (1.10471.*((Z).^2)*((X).^2))+(0.0481*(Y*Z)*14*X); surf(X,Y,Z,C); hold on; axis([-10 10 -10 10 10 10]);

Many thanks

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Answer 1

james 2012-3-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/32263-plotting-4dimentional-data-error#answer_40772

在 MATLAB Online 中打开

I changed my code to allow for this and still get the mistake!

x = -9:1:10; 
y = -9:1:10;
z = -9:1:10;
[X,Y,Z] = meshgrid(x,y,z);
C = (1.10471.*((Z).^2)*((X).^2))+(0.0481*(Y.*Z)*14*X);
surf(X,Y,Z,C);
hold on;
axis([-10 10 -10 10 10 10]);

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Walter Roberson 2012-3-14

C = (1.10471.*((Z).^2) .* ((X).^2))+(0.0481*(Y.*Z)*14*X);

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Answer 2

Sean de Wolski 2012-3-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/32263-plotting-4dimentional-data-error#answer_40765

在 MATLAB Online 中打开

))+(0.0481*(Y*Z)*14*X);
))+(0.0481*(Y.*Z)*14*X);

Note difference:

doc vectorize

to avoid these errors in the future.

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james 2012-3-14

Should this be done after every vector?

Sean de Wolski 2012-3-14

Whenever you get a error using {mtimes, mrdivide, mpower, mldivide}

and you don't want to be doing element-by-element multiplication.

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