46

Note  that  

MSPToExpression

 applies  a  security  check  to  the  input  variable.  You  should  be  aware  that  input

variables are a major source of danger and always use the secure conversion functions 

MSPBlock

 and 

MSPToEx 

pression

.  In  particular,  you  should  never  use  ToExpression  on  an  input  variable.  The  

Security

 section

documents the security system in more detail. 

It is also possible to return the result using MathML; this is described in greater detail in the section on 

MathML

. A

further discussion on formatting mathematics and graphics is given in the section on 

Displaying Mathematics and

Graphics

. 

An interesting point about the first msp:evaluate tag is that it contains two Mathematica commands. To use two

commands  in  the  same  tag  they can  be  separated  with  a   semi colon   ; . In  addition,  the  last command  is  also  fol 

lowed by a semi colon, this makes sure that no output from the tag is inserted into the output page. More informa 

tion on adding code into web Mathematica pages is given in 

Tips and Tricks: Coding in Pages

.

3.6 Live 3D Plotting: Plot3DLive.jsp

If  you  installed  webMathematica  as  described  

above

,  you  should  be  able  to  connect  to  this  JSP  via

http://localhost:8080/webMathematica/Examples/Plot3DLive.jsp.  (You  may  have  some  other  URL  for  accessing

your server.) It allows the user  to enter a function to be plotted by the LiveGraphics3D  applet. The source for

this page is in webMathematica/Examples/Plot3DLive.jsp.

 .