# [solved] while/for statement — what's wrong in a code?

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## [solved] while/for statement — what's wrong in a code?

 This post was updated on . 0 down vote favorite         Hi everybody. This is my Octave code     for K= 1:10     while ( p < 1 )         ceil(log2(K))  +  1/(1-(1-p)^K) %function         p = p + sens;         K     endwhile;  endfor  K and here is an output: ans =  10.000 K =  1 ans =  5.0000 K =  1 ans =  3.3333 K =  1 ans =  2.5000 K =  1 ans =  2 K =  1 ans =  1.6667 K =  1 ans =  1.4286 K =  1 ans =  1.2500 K =  1 ans =  1.1111 K =  1 ans =  1 K =  1 K =  10 So, as you can see -- in inner while statement value of K is fixed to 1. What I am supposed to do to vary this value between 1 and 10. Why it is not working? I have no idea why this inner while statement is proceed only once?
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## Re: while/for statement — what's wrong in a code?

 On Apr 30, 2011, at 2:53 AM, alhaim wrote: > > Hi everybody. This is my Octave code > >    for K= 1:10 >    while ( p < 1 ) >        ceil(log2(K))  +  1/(1-(1-p)^K) %function >        p = p + sens; >        K >    endwhile; > endfor > > K > > and here is an output: > > ans =  10.000 > K =  1 > ans =  5.0000 > K =  1 > ans =  3.3333 > K =  1 > ans =  2.5000 > K =  1 > ans =  2 > K =  1 > ans =  1.6667 > K =  1 > ans =  1.4286 > K =  1 > ans =  1.2500 > K =  1 > ans =  1.1111 > K =  1 > ans =  1 > K =  1 > K =  10 > > So, as you can see -- in inner while statement value of K is fixed to 1. > What I am supposed to do to vary this value between 1 and 10. Why it is not Before the start of the for loop initialize p to 0 or whatever? The way you've written it, p will always be greater than 1 for all K's above 1. _______________________________________________ Help-octave mailing list [hidden email] https://mailman.cae.wisc.edu/listinfo/help-octave
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## Re: while/for statement — what's wrong in a code?

 On Apr 30, 2011, at 3:15 AM, Liam Groener wrote: > > Before the start of the for loop initialize p to 0 or whatever? The way you've written it, p will always be greater than 1 for all K's above 1. Oop's, that should be initialize p before the while loop, not the for loop. _______________________________________________ Help-octave mailing list [hidden email] https://mailman.cae.wisc.edu/listinfo/help-octave
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## Re: while/for statement — what's wrong in a code?

 In reply to this post by Liam Groener-2 I should have mention it before -- p is set to 0.01 at the beginning. The whole code goes like this: sens = 0.1; p = 0.1; %K = 1; %ceil(log_2 K)+ 1/[1-(1-p)^K] for K= 1:10         while ( p < 1 )                 ceil(log2(K))  +  1/(1-(1-p)^K)   p = p + sens;   K   endwhile;  endfor    K
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## Re: while/for statement — what's wrong in a code?

 Sent from my iPad On Apr 30, 2011, at 3:21 AM, alhaim <[hidden email]> wrote: > I should have mention it before -- p is set to 0.01 at the beginning. > > The whole code goes like this: > > > sens = 0.1;     > p = 0.1;     > > %K = 1;     > > %ceil(log_2 K)+ 1/[1-(1-p)^K] > for K= 1:10 >    while ( p < 1 ) >        ceil(log2(K))  +  1/(1-(1-p)^K) >        p = p + sens; >        K >    endwhile; > endfor > > K-- > View this message in context: http://octave.1599824.n4.nabble.com/while-for-statement-what-s-wrong-in-a-code-tp3485616p3485642.html> Sent from the Octave - General mailing list archive at Nabble.com. > _______________________________________________ > Help-octave mailing list > [hidden email] > https://mailman.cae.wisc.edu/listinfo/help-octaveYep, but the p=0.1 should be the first statement in the for loop, just before the while statement. Otherwise p will always be greater than 1 for K greater than 1. _______________________________________________ Help-octave mailing list [hidden email] https://mailman.cae.wisc.edu/listinfo/help-octave
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## Re: while/for statement — what's wrong in a code?

 You're right. Thanks.