Android :: BigFraction Class In The Apache-Commons-Math Library Return Incorrect Division Results?
May 14, 2010
In the spirit of using existing, tested and stable libraries of code, I started using the Apache-Commons-Math library and its BigFraction class to perform some rational calculations for an Android app I'm writing called RationalCalc.
It works great for every task that I have thrown at it, except for one nagging problem. When dividing certain BigFraction values, I am getting incorrect results.
If I create a BigFraction with the inverse of the divisor and multiply instead, I get the same incorrect answer but perhaps that is what the library is doing internally anyway.
Does anyone know what I am doing wrong?
The division works correctly with a BigFraction of 2.5 but not 2.51, 2.49, etc...
[UPDATE]
This was indeed a bug in the apache-commons-math 2.0 libraries. The bug is fixed in v.2.1.
It is now listed in the Fixed Issues section of the bug tracker:
When multiplying two BigFraction objects with numerators larger than will fit in an java-primitive int the result of BigFraction.ZERO is incorrectly returned..attempting to reproduce the issue and setting me on the right track.
CODE:.....................
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Sep 28, 2010
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Dec 6, 2009
I am writing a ftp client on android sdk 1.5 with apache-commons-net- ftp-2.0. I can successfully connect to my testing ftp server but with I use listFiles() it return an empty FTPFile[].
I put the same code in a normal java program and it works fine. I don't know where is wrong. Any compatible problem when apache-commons- net-ftp-2.0 and android works together?
Here is my test code:
CODE:..................
It is actually 4 files and 1 directory in the ftp root!
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Jul 2, 2009
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http://groups.google.com/group/android-developers/browse_thread/threa...
In that program 2 libraries were used..
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When i check these libraries in my program, its show error....how to resolve this error?
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Jan 24, 2010
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Aug 19, 2009
How to use apache.commons in my android application.
I put the right import, but when I compile it I get the following error:
: package org.apache.commons.io does not exist import org.apache.commons.io.IOUtils;
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Sep 16, 2009
I am trying a simple send mail application using apache commons library.
Here is the code.
The email sending code is working fine in a standalone application.However when I try to run it as android application
It gave following error message. trouble processing "javax/naming/AuthenticationException.class": [2009-09-17 05:33:20 - Commons]
Attempt to include a core VM class in something other than a core library. It is likely that you have attempted to include the core library from a desktop virtual machine into an application, which will most assuredly not work. If you really intend to build a core library -- which is only appropriate as part of creating a full virtual machine binary, as opposed to compiling an application -- then use the "--core-library" option to suppress this error message. If you go ahead and use "--core-library" but are in fact building an application, then please be aware that your build will still fail at some point; you will simply be denied the pleasure of reading this helpful error message. [2009-09-17 05:33:20 - Commons] 1 error; aborting [2009-09-17 05:33:20 - Commons] Conversion to Dalvik format failed with error 1
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CODE:....................
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To enable logging for apache commons HttpClient in normal Java application I used:
CODE:...................
But on android I don't see logs in LogCat.
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Sep 13, 2010
I've removed my convoluted and badly malformed question so that it doesn't detract from the very neat and correct answer beneath. Given the (surprising) difficulty of finding an on-line example for doing this incredibly common task, I hope Yoni gets a few more up-ticks for his response.
So the question...How do I use Apache.Commons to upload a file to some destination. I'm using it in Android and uploading to a PHP script, but obviously it can work from any Java program and to any HTTP based listener.
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CODE:...................
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How do i import org.apache.commons packages into android so i can use them in my applications?
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May 11, 2010
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Do i have to include an external library? Then where can i find that library on the web?
CODE:.....................
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Nov 15, 2010
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CODE:.........
Now, the public Dialog start() method of OnlineActivities.java creates a dialog using the Context that was assigned via it's parameter.
When the Dialog is returned to onPostExecute I receive the following exception
CODE:......................
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[code]....
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This is the codecode...
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