How can I spilt long integer number into pairs?

Hi all,

I am working to solve the problem of finding the square root by using long division operation?

I know that there is a build in square root function but in my case I have to build my own function to find a square root by using a long division!

The first step of finding the square root by long division is decompose a number in two pairs and then work from that point.

ex: 1987 --> First pair(87), second pair(19) &&&& 198 --> First pair(98), second pair(1) as we should start pairing from right to left!

Could anyone help me to solve this issue? I wish if someone already has the code for perform square root by division! This will make live easier : )

Cheers,

Answer 1

[Niklas Nylén]

To split the integer x into pairs according to your description:

 x = 12345

 numDigitsInX = floor(log10(x))+1;

 pairs = zeros(ceil(numDigitsInX/2),1);

 for ii = 1:length(pairs)
     pairs(ii) = mod(x,100);
     x = (x-pairs(ii))/100;
 end

[Abdulatif Alabdulatif]

Thanks for response! but I have difficulties to collect splitted data.

I built a function called test to try your function:

function [ ] = test()

q=[ ];

x = 12345;

 numDigitsInX = floor(log10(x))+1;

 pairs = zeros(ceil(numDigitsInX/2),1);

 for ii = 1:length(pairs)

     pairs(ii) = mod(x,100);

     x = (x-pairs(ii))/100;

 q = [q x];

 end

 dsip(q);

end

and the result was:

q =

   123     1     0

which is not the result that I am looking for! I am looking for the following similar result:

q =

   45  23 1

or the inverse like

q =

     1 23  45

I am beginner in matlab, so it might me my fault of understanding this function.

wish you get my idea! : )

[Niklas Nylén]

What is q? The variable 'pairs' contains the number pairs.

pairs =

    45
    23
     1

Answer 2

[Abdulatif Alabdulatif]

Ture : )

Thank you so much!