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Index › Programming Questions & Help › Programs › import issue
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import issue (Read 566 times)
jdv
import issue
Jul 4th, 2008, 3:27pm  
Hi. I'm new to Processing. I would like to use a matrix computation package (mtj) within Processing, but on this instruction:

import no.uib.cipr.matrix.BandMatrix;

it triggers the following exception:

/tmp/build38983.tmp/Temporary_5469_5682.java:1:57:1:85: Semantic Error: The import "no/uib/cipr/matrix/BandMatrix" is not valid, since it does not name a type in a package.

I have no problem using this library in a standard .java program, since the jar is in my classpath (/etc/environment => CLASSPATH="/home/jd/dev/java:/usr/share/java:/usr/share/java/mtj.jar:/usr/share/
java/jama.jar:/opt/colt/lib/colt.jar:/opt/colt/lib/concurrent.jar").

Must I add something specific for Processing, or copy/jink the lib in a Processing folder? I did not find the answer in the forum, sorry if the question seems stupid :)

Thank you.
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koogy
Re: import issue
Reply #1 - Jul 5th, 2008, 5:08pm  
what you're doing looks ok.

and it seems to be a problem with the jar rather than the classpath (am pretty certain you'd get a more basic error if it couldn't find the jar).

could it be using a different version of java? something like that?
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PhiLho 
Re: import issue
Reply #2 - Jul 5th, 2008, 7:03pm  
Providing a simple link like Matrix Toolkits for Java (MTJ) would have saved a few minutes of search... Is that where you got it Looks like the Jar file on this site is made with Java 1.5 (and I think Java libraries are upward compatibles anyway), and you say it worked in plain Java anyway, so I don't think koogs' hypotheses are funded, alas.

I believe that you must create the mtj/library folders in the library directory of Processing, and put the jar file there.
When I did that, the error has disappeared.
I don't know if there is a less constraining way to do that in Processing... Putting the jar in a data folder in the sketch folder doesn't seem to work, alas.
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jdv
Re: import issue
Reply #3 - Jul 7th, 2008, 10:52am  
Hi. I eventually found a workaround: I put the jar in a code/ directory of my sketch. Thank you for your help!
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