Hi Karen, You probably will want to use one of the expression actors to calculate a complex formula. Your main choices are:
Expression: allows arithmetic and statistical operations on data, including power functions and logarithms, that can be expressed as a single statement RExpression: allows scripts of arbitrary complexity to be run on the R System for statistical computing, including simple arithmetic, vector and matrix operations, and complex statistical operations. R is a full-featured scientific computing language. MatlabExpresion: similar to the RExpression, but obviously depends on the Matlab system for its execution Any of these systems should be able to do what you want. To use these, you just drag the appropriate actor to the canvas, add named input ports, and then create the expression referring to those named ports. For example, if you created input ports with names "x" and "y" you could write an expression like this: log(x) + log(y) and the output will be emitted on the output port. With the RExpression actor you also create named output ports to map your script variables to the appropriate outputs. Hope this helps. Matt Karen Tang wrote: > Hi, > > I am new in Kepler and I need to have a complicated formula in the > workflow. The formula should take three inputs (web services' outputs), > do a complex calculation (including exponent, logrithm) then generate a > single value. > > How can I add the formula in Kepler? Do I need to have this in a Java > class, then do it follow steps listed in your archived message > (http://mercury.nceas.ucsb.edu/ecoinformatics/pipermail/kepler-users/2006-March/000068.html)? > > I couldn't succeed. Can you give more detailed instructions? An example > will be great. > > My goal is to enable users(ocean scientists around the world) use > workflows I created. I am using Windows XP. > > Thanks in advance. > > Karen > > > > > > _______________________________________________ > Kepler-users mailing list > Kepler-users at ecoinformatics.org > http://mercury.nceas.ucsb.edu/ecoinformatics/mailman/listinfo/kepler-users > -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Matthew B. Jones jones at nceas.ucsb.edu Ph: 541-888-2581 ext. 287 National Center for Ecological Analysis and Synthesis (NCEAS) UC Santa Barbara http://www.nceas.ucsb.edu/ecoinformatics ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
