fixing the values in matrix when it come between 0 and 1

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Offroad Jeep 2015-9-10

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关闭： MATLAB Answer Bot 2021-8-20

Hi all,I want to fix the values in matrix which comes between 0 and 1 and the other values carry on till the time when all the values are between 0 and 1. when all the values are between 0 and 1 the program should break.

a = randi(5,5)
nmc = 1000
for i = 1:nmc
    b = rand(1)
c = a - b
if c < a
a = c
if (a > 0) && (a < 1)
     break;       
 end
end
end

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Offroad Jeep 2015-9-10

Thanks it was quite informative..............

Image Analyst 2015-9-10

Then put it into action. Your code is still not formatted properly.

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Answer 1

Image Analyst 2015-9-10

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编辑：Walter Roberson 2015-9-10

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I think you're trying to do this:

% Generate random numbers between 1 and 5.
a = randi(5,5)
nmc = 10000
for i = 1 : nmc
  b = rand(1);
  c = a - b; % c is a 5x5 matrix.
  lessThanA = c < a;
  % If c is less than a (which it will be),
  % replace a with c.  a will be smaller.
  a(lessThanA) = c(lessThanA);
  if all(a(:)>0 & a(:)<1)
    break;
  end
end
a

but I never got it to meet the condition for breaking.

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Offroad Jeep 2015-9-10

Not working..........

Image Analyst 2015-9-11

That's because I did exactly what you asked for, which is not what you really want. I think Hamoon's latest solution, where b is some fraction of a, is probably what you want. If it is, please officially "Accept" his solution.

Answer 2

Hamoon 2015-9-10

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编辑：Hamoon 2015-9-10

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Thank you image Analyst, I just changed the code a little bit, I think this is what 4*4 wants:

 a = randi(5,5);
 while true
        condition = a>=0 & a<=1;
  b = rand(1);
  c = a - b; % c is a 5x5 matrix.
  lessThanA = c < a;
  % If c is less than a and condition isn't met,
  % replace a with c.  a will be smaller.
        indexes = lessThanA & ~condition;
  a(indexes) = c(indexes);
  if all(condition)
    break;
  end
 end
 a

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Offroad Jeep 2015-9-10

Dear Hamoon thanks for your efforts. I will let you know what i want. I have random direction of mangetic moments. when magnetic field is applied at an angle theta, they all start getting aligned with the magnetic field. when random numbers are subtracted all numbers should come in between 0 and 1 so that all the values come in same range and hence i can proceed with my simulations further this is the first step of my simulations for exchange bias. .... In more easy words I am trying to simulate FERROMAGNETISM.................. Regards and many thanks for your concern and efforts......

Hamoon 2015-9-11

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It's OK, I got the problem here, the point is that "b" should NOT be a simple random value, you'd better calculate "b" based on magnetic field alignment formulation, but if you want to simply use random numbers for "b", you should consider that "b" is dependent to "a", in other words the amount that you subtract from "a" to force it to be aligned according to magnetic field, is dependent to "a". Here, i'm considering "a" shows the differences between orientation of a magnetic domain and an external magnetic field direction applied to that domain. So here, if a=0 then "b" should be zero.So "b" cannot be a simple random number. considering this fact, I just changed "b" a little bit and here is the code:

 a = randi(5,5);
 while true
   b = rand(1)*a;
   a = a - b; 
   if all(a>0 & a<1)
         break;
   end
 end
 a

here "b" is a random matrix, but it is dependent to "a", actually "b" is a random proportion of "a". I implemented the dependency of b to a using b=rand*a you may want to do something else, but it's all about "b", you don't need to change anything else.

here I also didn't define "c" variable, we don't need that.