error in debugging the algorithm

Question

I'm trying to make an algorithm in Matlab that scans the character array from left to right and if it encounters a space, it should do nothing, but if it encounters 2 consecutive spaces, it should start printing the remaining quantities of array from next line. for example,

inpuut='a bc  d';

after applying this algorithm, the final output should have to be:

a bc

d

but this algorithm is giving me the output as:

a bc

d d

Also, if someone has got a more simpler algorithm to do this task, do help me please :)

m=1; t=1;
inpuut='a bc  d';

while(m<=(length(inpuut)))

    if((inpuut(m)==' ')&&(inpuut(m+1)==' '))
        n=m;
        fprintf(inpuut(t:(n-1)));
        fprintf('\n');
        t=m+2;
    end    

    fprintf(inpuut(t));

    if(t<length(inpuut))
        t=t+1;
    elseif(t==length(inpuut))
        t=t-1;
    else
    end

    m=m+1;

end
fprintf('\n');

@Yvon, i've an array containing text, i want to scan it from left to right just as strtok command of matlab, and display the characters; but i want that if it encounters 2 consecutive spaces while scanning from left to right, it should start printing the remaining characters from next line. — user3801619
– user3801619, Commented Aug 11, 2014 at 21:58

Yvon · Accepted Answer · 2014-08-11 22:26:33Z

4

OK I gave up telling why your code doesn't work. This is a working one.

inpuut='a bc  d  ';

% remove trailing space
while (inpuut(end)==' ')
    inpuut(end)=[];
end

str = regexp(inpuut, '  ', 'split');
for ii = 1:length(str)
    fprintf('%s\n', str{ii});
end

regexp with 'split' option splits the string into a cell array, with delimiter defined in the matching expression.

fprintf is capable of handling complicated strings, much more than printing a single string.

You can remove the trailing space before printing, or do it inside the loop (check if the last cell is empty, but it's more costly).

edited Aug 11, 2014 at 22:26

answered Aug 11, 2014 at 22:03

Yvon

3,0032 gold badges20 silver badges41 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

user3801619 Over a year ago

in which part of the algorithm, i've to make this change? i also know that my code is failing when it encounters one or more spaces in the end, the problem is that i'm not able to fix it :( i know these are a bit foolish sort of questions to ask, but as i'm very new to matlab, so i don't have that much idea of it :(

rayryeng Over a year ago

@Yvon - I laughed out loud when I read your first statement. That alone gave you a +1. However, good job in fixing the code :)

rayryeng Over a year ago

@user3801619 - Replace all of your code with the one Yvon has given you.

user3801619 Over a year ago

thank u so very much @Yvon :) its working fine now (Y)

nkjt Over a year ago

+1 although you could also use deblank to get rid of trailing whitespace.

Luis Mendo · Accepted Answer · 2014-08-11 22:46:26Z

2

You can use regexprep to replace two consecutive spaces by a line feed:

result_string = regexprep(inpuut, '  ', '\n');

If you need to remove trailing spaces: use this first:

result_string = regexprep(inpuut, '  $', '');

answered Aug 11, 2014 at 22:46

Luis Mendo

113k13 gold badges80 silver badges154 bronze badges

Comments

user1980812 · Accepted Answer · 2014-08-11 23:05:17Z

1

I have a solution without using regex, but I assumed you wanted to print on 2 lines maximum.

Example: with 'a b c hello':

a b
c  hello

and not:

a b
c
hello

In any case, here is the code:

inpuut = 'a b  c';
while(length(inpuut) > 2)
    % Read the next 2 character
    first2char = inpuut(1:2);
    switch(first2char)
        case '  ' % 2 white spaces
            % we add a new line and print the rest of the input
            fprintf('\n%s', inpuut(3:end));
            inpuut = [];
        otherwise % not 2 white spaces
            % Just print one character
            fprintf('%s', inpuut(1))
            inpuut(1) = [];
    end    
end
fprintf('%s\n', inpuut);

answered Aug 11, 2014 at 23:05

user1980812

813 bronze badges

Collectives™ on Stack Overflow

error in debugging the algorithm

3 Answers 3

5 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

5 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related