VSQ: I need your help to plot a 4D function (the 4th dimension is the colour)

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max
max 2013-3-25
The function I have to plot is:
RamBoxCox=0.0688 - 0.0748 * E + 0.000079 * PRR + 0.000209 * v - 0.00882 * S - 0.00231 * E*PRR + 0.000099 * PRR*S - 0.000001 * PRR*v*S
I've tried to plot it in this way:
clc
close all
clear all
syms PRR v E S
assume (0.1 < E < 0.1)
assume(1 < S < 4)
assume(20 < PRR < 70)
assume(25 < v < 100)
RamBoxCox=0.0688 - 0.0748 * E + 0.000079 * PRR + 0.000209 * v - 000882 * S - 0.00231 * E*PRR + 0.000099 * PRR*S - 0.000001 * PRR*v*S
%%Plot
%
cs=25;
cm=jet(cs*5);
ezsurf(E,v,RamBoxCox,'color',cm(S*cs,:))
In this way, the error is that the symbolic variable doesn't implementate the <=,< ecc...
Could you help me?
  1 个评论
Jan
Jan 2013-3-25
编辑：Jan 2013-3-25
Please format your code properly and use meaningful tags. Thanks.
The brute clearing header "clc; close all; clear all" wastes a lot of time, usually deletes existing results, but has advantages only in case of massive programming errors, which should be caught by smarter methods.

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回答（1 个）

Walter Roberson
Walter Roberson 2013-3-25
Which MATLAB version are you using? I think the ability to use chains of relationships like
assume (1 < S < 4)
must be quite new. Try
assume( 1 < S & S < 4)
Note: you assume() that E is greater than 0.1 and less than 0.1, which is the empty set.

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