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How to find maximum value for 3 iterative variables.

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Shantanu K
Shantanu K 2013-3-7
In this i have to do following operation mentioned:
Here value of a,b,z are changing continuously. For every value program will calculate value of 'y'.
It will become three dimensional array.
For entire these iterations i have to find out maximum value of 'y' and corresponding value of 'a' & 'b'.
I am facing one more problem, when i formulated array it was showing lot more zeros.
for p=1:6
a=2*p;
for q=1:6
b=5*q;
for z=1:100
k=z*z;
x=k*4+1;
y=a*x+b*k+1;
y(p,q,z)=y;
end
end
end
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Walter Roberson
Walter Roberson 2013-3-7
Do you want the 'a' and 'b' (as you wrote the first time) or the 'p' and 'q' (as you write now) ?

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2013-3-7
编辑：Andrei Bobrov 2013-3-7
max1 = [-inf 0 0 0];
for p=1:6
for q=1:6
for z=1:100
a=2*p;
b=5*q;
k=z*z;
x=k*4+1;
k1 = a*x+b*k+1;
y(p,q,z) = k1;
if k1 > max1(1), max1 = [k1,p,q,z]; end
end
end
end

更多回答（1 个）

Walter Roberson
Walter Roberson 2013-3-7
Before loop:
maxy = -inf;
a_at_max = -inf;
b_at_max = -inf;
then inside the loop, where you assign into y, test to see if the new value is greater than maxy, and if it is, record the a and b values
  2 个评论
Shantanu K
Shantanu K 2013-3-7
I am not able to understand it sir, can you please elaborate?
then inside the loop, where you assign into y, test to see if the new value is greater than maxy, and if it is, record the a and b values This part i am not able to convert to program.
Walter Roberson
Walter Roberson 2013-3-7
if y(p,q,z) > maxy
%then update your record of which "a" and "b" values led to this maximum
end
Oh yes and remember to update maxy with the new maximum as well.
Hint: "update" means "do an assignment to"

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