two variables with known values in equations; use loop in matlab
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Norzuria Ibrahim
il 29 Set 2015
Commentato: Norzuria Ibrahim
il 29 Set 2015
Hi I have question to ask. I have 3 variables with known variables, x, y, z.
x= 3, 1 , 4, 2, 1
y=3,4 ,5,1,1
z=2,2,1,2,2
I need to apply those variables in two related equations
d=x+y+2z
e=2d+xyz
how to solve this using loop
what I did
x=[3 1 4 2 1];
y=[3 4 5 1 1];
z=[2 2 1 2 2];
for i=1:length(x);
j=1:length(y);
k=1:length(z);
d=x(i)+y(j)+2*z(k)
d=d+1
e=2*d+(x(i)*y(j)*z(k))
end
did not work
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Risposta accettata
Andrei Bobrov
il 29 Set 2015
x=[3 1 4 2 1];
y=[3 4 5 1 1];
z=[2 2 1 2 2];
d=x+y+2*z;
e=2*d+x.*y.*z;
4 Commenti
Walter Roberson
il 29 Set 2015
The code that Andrei provided does all of them at the same time. No loop is required.
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WAT
il 29 Set 2015
Modificato: WAT
il 29 Set 2015
It's a little unclear from your question, but if you mean you have 3 dependent variables (x,y,z) each observed at 5 different values of some independent variable (for example, x(t),y(t) and z(t)), and you want the values of c and e at those same times, then all you need to do is
d=x+y+2*z
e=2*d+x.*y.*z
The decimal in front of the multiply tells MATLAB to do the multiplication componentwise, rather than matrix multiplication.
Unless you're required to use a loop (for a HW assignment), in which case it would be something like
d = zeros(1,5);
e = zeros(1,5);
for i = 1:5
d(i) = x(i) + y(i) + 2*z(i);
e(i) = 2*d(i) + x(i)*y(i)*z(i);
end
But you don't want to do it this way unless you're explicitly required to use a loop.
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