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Mike Buess
USA
3037 Posts |
 Posted - 01/03/2005 : 12:43:39 PM
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There's no built in function for that but you can write a LabTalk script that will extend the summation until the result reaches a predetermined precision. The following script will stop summing when the result after the nth term is within 0.1% of the previous result.
precision=1E-3;
sum=0;
for(n=0;n>=0;n++) {
x=<your function of n>;
if( abs(x)<precision*abs(sum) ) break;
sum+=x;
if( mod(n,100) ) continue;
type $(n): $(sum);
};
n=; // how long it took to converge
sum=; // resulting sum
It types a partial result every 100 terms for a reality check. (Hit Escape if it looks like the sum is not converging.)
Mike Buess
Origin WebRing Member
Edited by - Mike Buess on 01/03/2005 1:00:48 PM |
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sum function
