strings operations, how long is string, changing specific strings

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Lukasz Jarod
Lukasz Jarod 2015-1-11
编辑： Stephen23 2015-1-11
I have a variable "F" where i have 6-7 charcters , now my questions are:
  • 1 how i can cheack how long is this string?
  • 2 now if it have 7 characters then i want to:
  • for characters in position 1-3 if charcter=0 chacnge it into O , and for position 3-7 if charcter=O change it into 0,
  • how can i do that?

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Stephen23
Stephen23 2015-1-11
编辑：Stephen23 2015-1-11
Try this:
F = '000OOOO';
if numel(F)==7
F(1:3) = strrep(F(1:3),'0','O');
F(4:7) = strrep(F(4:7),'O','0');
end
I assumed that you meant your second range to start from 4.

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