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<br><BR>Thanks Julian.<BR>Handy.<BR><br><BR><br><div>From: Julian.Tenney@nottingham.ac.uk<br>To: xerte@lists.nottingham.ac.uk<br>Date: Wed, 27 Jul 2011 13:39:39 +0100<br>Subject: [Xerte] Re: sum part of array?<br><br><pre>I did it like this so you can pass one param for sum from 0th to nth item, or n,m for the a sum of the range between n an m, or no params for sum of it all:<br> <br>Array.prototype.sum = function(n,m) {<br> if (arguments.length == 1){<br> return this.slice(0,n).sum()<br> } <br> if (arguments.length == 2){<br> return this.slice(n,m).sum()<br> }<br> <br> var sum = 0;<br> for (var i = 0; i<this.length; i++) {<br> sum += this[i];<br> }<br> return sum;<br>};<br> <br>-----Original Message-----<br>From: xerte-bounces@lists.nottingham.ac.uk [mailto:xerte-bounces@lists.nottingham.ac.uk] On Behalf Of Julian Tenney<br>Sent: 26 July 2011 16:18<br>To: Xerte discussion list<br>Subject: [Xerte] Re: sum part of array?<br> <br>myArray.slice(n,m).sum();<br> <br>//test code/////////////////////////////////<br>Array.prototype.sum = function() {<br> var sum = 0;<br> for (var i = 0; i<this.length; i++) {<br> sum += this[i];<br> }<br> return sum;<br>};<br> <br>myArray = [0,1,2,3,4,5,6];<br> <br>trace(myArray.slice(1,1).sum()); //n and m are 1 based, not zero??<br> <br> <br>-----Original Message-----<br>From: xerte-bounces@lists.nottingham.ac.uk [mailto:xerte-bounces@lists.nottingham.ac.uk] On Behalf Of Pat Lockley<br>Sent: 26 July 2011 15:30<br>To: Xerte discussion list<br>Subject: [Xerte] Re: sum part of array?<br> <br>eval(array.join("+")) ?<br> <br>On Tue, Jul 26, 2011 at 2:50 PM, Dave Burnett <d_b_burnett@hotmail.com> wrote:<br>><br>><br>> Just out of curiosity, is there any way to sum part of an array?<br>><br>><br>> [1,2,3,4,5]<br>><br>><br>> Lets say I have an index variable and I always will want to sum from 0 to<br>> that variable.<br>><br>><br>> pseudo<br>> my_array.sum(0,var);<br>><br>><br>> Or am I forced to loop + add?<br>><br>><br>> Or any elegant way to create a temp array of the target elements and sum on<br>> that instead?<br>><br>><br>> Dave<br>><br>><br>><br>><br>><br>> This message and any attachment are intended solely for the addressee and<br>> may contain confidential information. If you have received this message in<br>> error, please send it back to me, and immediately delete it. Please do not<br>> use, copy or disclose the information contained in this message or in any<br>> attachment. Any views or opinions expressed by the author of this email do<br>> not necessarily reflect the views of the University of Nottingham.<br>><br>> This message has been checked for viruses but the contents of an attachment<br>> may still contain software viruses which could damage your computer system:<br>> you are advised to perform your own checks. Email communications with the<br>> University of Nottingham may be monitored as permitted by UK legislation.<br>><br>> _______________________________________________<br>> Xerte mailing list<br>> Xerte@lists.nottingham.ac.uk<br>> <a href="http://lists.nottingham.ac.uk/mailman/listinfo/xerte" target="_blank">http://lists.nottingham.ac.uk/mailman/listinfo/xerte</a><br>><br>> This message and any attachment are intended solely for the addressee and<br>> may contain confidential information. If you have received this message in<br>> error, please send it back to me, and immediately delete it. Please do not<br>> use, copy or disclose the information contained in this message or in any<br>> attachment. Any views or opinions expressed by the author of this email do<br>> not necessarily reflect the views of the University of Nottingham.<br>><br>> This message has been checked for viruses but the contents of an attachment<br>> may still contain software viruses which could damage your computer system:<br>> you are advised to perform your own checks. Email communications with the<br>> University of Nottingham may be monitored as permitted by UK legislation.<br>><br>><br>><br> <br>_______________________________________________<br>Xerte mailing list<br>Xerte@lists.nottingham.ac.uk<br><a href="http://lists.nottingham.ac.uk/mailman/listinfo/xerte" target="_blank">http://lists.nottingham.ac.uk/mailman/listinfo/xerte</a><br> <br>_______________________________________________<br>Xerte mailing list<br>Xerte@lists.nottingham.ac.uk<br><a href="http://lists.nottingham.ac.uk/mailman/listinfo/xerte" target="_blank">http://lists.nottingham.ac.uk/mailman/listinfo/xerte</a><br></pre><br>_______________________________________________
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