# multi-variable looping problem

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Arjun il 7 Mag 2014
Commentato: Arjun il 8 Mag 2014
I need to perform a multi-variable loop for the following conditions and I have problem doing it
Info: initial_a = 1000 initial_b = 100 initial_c = 0.2 initial_d = 10
Equation x = 5a + b^2 + c/2 + 0.25d
program should start with initial_a does not changes but value of b changes with increment of 10 till 200, a changes with increment of 0.01 till 0.3 and d changes with increment of 1 till 20.
then in continues to by increasing value of initial_a by 100 and the same condition of b,c,d applies
the loop should end when intial_a is 20000
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José-Luis il 7 Mag 2014
Modificato: José-Luis il 7 Mag 2014
What have you tried so far? Sounds like your problem could be solved with four nested loops. It could also be achieved through vectorization. What's your increment step?
Arjun il 8 Mag 2014
I tried the nested loops, it kinda worked....but what do u mean by vectorization? tq

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### Risposta accettata

Hugo il 7 Mag 2014
for a=1000:100:20000
ia=floor(a/100)-9;
for b=100:10:200
ib=floor(b/10)-9;
for c=.2:.01:.3
ic=floor(c/.01)-19;
for d=10:1:20
id=d-9;
x(ia,ib,ic,id)= 5*a + b^2 + c/2 + 0.25*d
end
end
end
end
The variables ia, ib, ic, id are there just for being able to index the variable x. It would also be advisable to allocate space for x before the loops using x=zeros(191,11,11,11);
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### Più risposte (1)

Arjun il 7 Mag 2014
tq very much my fren =)
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