Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


dpb
Posts:
9,242
Registered:
6/7/07


Re: iterations adjustments UPDATED
Posted:
Nov 23, 2012 5:23 PM


On 11/23/2012 3:32 PM, ARTEMIS CIVIL wrote: > Hello, I really have to deal with the problem below. I am a beginner in > matlab and my deadline is quite pressing. Thank you in advance! > Well, I have to guess an initial value "n" in order to find the ultimate > value > "Pu". When the extracting Pu deviates from a specific defined value (Pe) > more > than 0.1% then I need the code to make use of the last value of "Pu" to > find the correct n until the parameter "Pu"reach the Pe. Otherwise the > parameter n is kept. > such as: > input: n > results: Pu > target: pe > dp=pupe > if dp<0.1% keep n > or else n=n+dn and again from the begining until the Pe is reached! > Thanks!!
Better to not keep making new threads, also...
You've gone to the other extreme now w/ perhaps too little, but
Enclose the computation in a WHILE loop, initializing the error to a large value
dp=inf; % initialize difference to big number err=0.1; % set an error criterion n=n0dn; % initialize n while dp>err ... n=n+dn; % compute here dp=pupe; end
This will stop the loop when the error criterion is met w/ the value of n that satisfied it by having the n+dn term before the computation.




