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This example allows the user to enter a function to be integrated. The result is then formatted by the typesetting
system and saved as an image. The source for this page is in webMathematica/Examples/
Integrate.jsp. A section that shows the form tag is shown below.
<%@ page language="java" %>
<%@ taglib uri="/webMathematica taglib" prefix="msp" %>
Integration
Integrate a function
integrand = Null;
page variable to hold the integrand
If[ MSPValueQ[ $$expr],
integrand =
interpret input with secure conversion
MSPToExpression[ $$expr]] ;
value=" MSPValue[ $$expr,
"Sin[x]^2"]" />
carry out the integration
If[ integrand =!= Null,
MSPFormat[
Integrate[integrand,x],StandardForm]]
In this example, an msp:evaluate tag integrates an expression and uses
MSPFormat
to format the result with
StandardForm. This generates an image and returns a reference to the image. For this to work, it is necessary to
use the Mathematica front end.
The example also demonstrates the use of page variables with
MSPToExpression
. This is an alternative to
using
MSPBlock
suitable in certain constructions, for example, when the input will be used in a number of
computations. The page variable integrand is initialized to Null and later, if its value has been modified, the
integration is carried out. It is assigned to the interpreted value of $$expr only if this input variable actually has a
value. Note that if an error, such as a security error, is encountered in interpreting $$expr, an exception will be
thrown and integrand will remain assigned to Null.
.
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