hello experts...see I am executing a code....want some suggestions

    My code is
    %script----------------------------------%
    X= ' PPtPPPPP';
    lengh=numel(X);
    aaAA=estring(X);
    zz=numel(aaAA);
    comp_ratio=(lengh)/(zz)

    %------------------------------------------
    function  y = estring(str)
    len = numel(str);
    i = 0;
    count = zeros(1,len);
    y=[];
    while( i<len )
      j=0;
      count(i+1) = 1;
      if(count==1)
                y=[y 1];
      while( true )
          j = j + 1;
          if( i+j+1 > len )
              break;
          end
          if( str(i+j+1)==str(i+1) )
              count(i+1) = count(i+1) + 1;
          else
              break;
          end
      end
        if( count(i+1)==1 )
            a=str(i+1);
            length(a);

            y = [y a];
            i = i + 1;

        else
            a=str(i+1);
            b=count(i+1);
            y =[y a b];
            i = i + b;
        end
    end
    end

Input: PPtPPPPP
numel(Input)=8
*Output :* P tP [space at the end]
numel(Output)=5

I want this to be like Output" P t P [space] numel(output)=4

Please help me to modify the code to consider single count as character plus space

Answer 1

[Walter Roberson]

To achieve that output:

• do not do anything special for count 1: treat it like all of the others
• Output = fliplr( aaAA(1:2:end) )

[tina jain]

Thank you for your reply. But I am not getting it. Can you please elaborate?

[Walter Roberson]

Replace the line

if( count(i+1)==1 )

with

if false

Then in your test script after you have computed the compression ratio,

bytes_from_encoding = aaAA(1:2:end );
reversed_bytes = fliplr(bytes_from_encoding);
str_of_reversed_bytes = char(reversed_bytes);

[tina jain]

It is giving just a reversed string Not the desired output

[Walter Roberson]

Please show

X
aaAA
str_of_reversed_bytes

[tina jain]

   X

X =

ttP

>> aaAA

aaAA =

t P

>>  str_of_reversed_bytes

str_of_reversed_bytes =

Pt

[Walter Roberson]

You did not use the same X as in your problem statement, so I cannot compare the result to what you had stated that you wanted.

[Walter Roberson]

Those spaces are not really spaces. See http://uk.mathworks.com/matlabcentral/answers/215294#comment_283959

[tina jain]

done with this....but I want to know further....in some situations it is giving compression ratio up to 100...is it OK?