Error wiritting an expression
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Hi,
I have an error expression when I write the expression below:
Z=(0.5176*(116*((1./(X+0.08*Y))-(0.035./(Y.^3+1)))-0.4*Y-5)*exp((-21)*((1./(X+0.08*Y))-(0.035./(Y.^3+1))))+0.0068*X)
So to look for the error, I write the first expression which is :
A=0.5176*(116*((1./(X+0.08*Y))-(0.035./(Y.^3+1)))-0.4*Y-5)
and I simulate it and it works
the same thing for the second expression, when I simulate it it works :
B=(exp((-21)*((1./(X+0.08*Y))-(0.035./(Y.^3+1)))))+0.0068*X
The problem is that the expression Z is equal to A*B and when I simulate it, it generates an error expression
2 个评论
KSSV
2016-12-28
Post the full code....you have to read about element by element matrix operations.
Hicham Lhachimi
2016-12-28
编辑：Walter Roberson
2016-12-28
回答（1 个）
Star Strider
2016-12-28
编辑：Star Strider
2016-12-28
You have used element-wise calculations in your code except for the multiplication between the terms:
Z = A .* B
If ‘A’ and ‘B’ work independently, then that should make them work in ‘Z’ as well.
----------------------------
EDIT —
x=0:1:20;
y=0:2:20;
[X, Y]=meshgrid(x,y);
Z=0.5176*(116*((1./(X+0.08*Y))-(0.035./(Y.^3+1)))-0.4*Y-5).*(exp((-21)*((1./(X+0.08*Y))-(0.035./(Y.^3+1)))))+0.0068*X;
→ → → → → → ↑ DO ELEMENT-WISE MULTIPLICATION HERE
figure(1)
mesh(X,Y,Z)
grid on
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2016-12-28
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2021-8-20
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