how can i use 'OR' logic inside IF statement ?

Sir, in my code O1 is an output of neural network. In 'O1'O is not a zero its an alphabet 'O'. then why should I use 'strcmp' in code.

[dpb]

I don't understand the question as posed but the result of your double loop in nn_new1 is simply

O1=O1>0.78;

no loops of if needed at all. "It's the Matlab way" :)

I think you need to explain what you're actually trying to do in the portion of the code with the 0-1 vectors and the variable name.