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I have a requirement to calculate the average of a very large set of doubles (10^9 values). The sum of the values exceeds the upper bound of a double, so does anyone know any neat little tricks for calculating an average that doesn't require also calculating...
Started by Simon on
, 18 posts
by 18 people.
Answer Snippets (Read the full thread at stackoverflow):
Be adaptively computed by calculating the average of an increasing number of randomly chosen samples.
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I don't know why the following haskell source code for calculating products recursively only using addition doesn't work.
mult a b = a + mult a (b-1)
I'm always getting a stack overflow error.
Started by Jörg on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
A base case and a recursive....
Mult a 0 = 0 mult a b = a + mult a (b-1)
with any recursive function, there should be at least 2 cases .
What happens if b is 0 ?
You'll have to specify a termination condition, otherwise the recursion will run infinitely .
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Before i re-invent this particular wheel, has anybody got a nice routine for calculating the size of a directory using Python? It would be very nice if the routine would format the size nicely in Mb/Gb etc. Thanks.
Started by Gary Willoughby on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
This grabs subdirectories:
import os start_path = '.' total_size = 0 for dirpath, dirnames, filenames in os.walk(start_path): for f in... .
Http://mail.python.org/pipermail/python-list/2000-June/037460.html that does the rounding for you.
I found this one.
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Ask your Facebook Friends
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I recently wrote a Bayesian spam filter, I used Paul Graham's article Plan for Spam and an implementation of it in C# I found on codeproject as references to create my own filter.
I just noticed that the implementation on CodeProject uses the total number...
Started by Waleed Eissa on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
Please see the paper for the exact calculations.
Token count, for calculating the probability.
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Hi there,
i´m currently dealing with gps data combined with precise altitude measurement. I want to calculate the distance between two consecuting points. There is a lot of information out there about calculating distance between two points using the ...
Started by Joachim Kerschbaumer on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
And over any distance where the difference in altitudes matters you should probably just use straight... .
I would suggest that over any distance where using the WGS84 would give you significantly better accuracy that the difference in altitude won't matter .
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Say I have an arbitrary set of latitude and longitude pairs representing points on some simple, closed curve. In Cartesian space I could easily calculate the area enclosed by such a curve using Green's Theorem. What is the analogous approach to calculating...
Started by Paul A. Hoadley on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
calculating an arbitrary polygon, I would use something like a Lambert Azimuthal Equal Area.
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Hi, i want to calculating no of lines when we give text in UITableviewcell?i have inserted text through UITextview which is in UITableview cell.but i want to increase the height of cell based on UItextview which is in UITableview cell.suppose if it has...
Started by senthilmuthu on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
For example:
NSString *myText = @"....
To calculate the approximate size of your UITextView based on a string, try NSString 's - (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size lineBreakMode:(UILineBreakMode)lineBreakMode method.
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This is the one thing I could never get to work.
My problem is to detect the end of one day and the start of the next and then splitting the diff into each day.
Imagine you want to calculate a pay rate but it has to span across midnight.
It also applies...
Started by Gustavo Carreno on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
I prefer to record all times in Unix Epoch, that way it's as simple as
hoursWorked = ((stopTime - startTime)/60)/60
Here is a full solution it's in PHP but should be easy enough to build to any language:
<?php $startTime = "12/31/2008 22:02"; //No ... .
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I am currently working on a database ad rotating system where some of the ads have higher impression (or rank) than others and should be shown more often.
What is the best way for calculating the impression rank while still keeping the appearance of "...
Started by meep on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Here is a great solution which allows for weighting, its coldfusion but the sql is there too article
DECLARE @girl TABLE ( id INT IDENTITY( 1, 1 ), name VARCHAR( 50 ), weight INT ); INSERT INTO @girl ( name, weight )( SELECT 'Sarah', 100 UNION ALL SELECT... .
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I'm currently in the middle of playing with a BNF grammar that I hope to be able to wrangle into a LL(1) form. However, I've just finished making changes and calculating the new FIRST and FOLLOW sets for the grammar by hand for the third time today and...
Started by Zxaos on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
As a group, we decided we wanted to be able to hand-write the parser from scratch, so we had to aim for an LL(1) grammar, since it would... .
A year ago, we had a semester project at the university I attend, where our task was to create a programming language .
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