org.lsmp.djep.vectorJep.function
Class Ele
java.lang.Object
org.nfunk.jep.function.PostfixMathCommand
org.lsmp.djep.vectorJep.function.Ele
- All Implemented Interfaces:
- BinaryOperatorI, PostfixMathCommandI
public class Ele
- extends PostfixMathCommand
- implements BinaryOperatorI
ele(x,i) returns the i-th element of a vector x.
ele(m,[i,j]) returns the (i-th,j-th) element of a matrix m.
Note this follows the mathematical indexing convention with indices starting from 1
rather than the computer science convention with indices starting from 0.
Hence
a = [1,2,3,4];
ele(a,1); // returns 1
m = [[1,2],[3,4]];
ele(m,[2,2]); // return 4
New parser feature allow a[] notation to be used.
a=[1,2,3,4];
a[3]; // returns 3
b=[[1,2],[3,4]];
b[1,2]; // returns 2
- Author:
- Rich Morris
Created on 15-Nov-2003
Constructor Summary |
Ele()
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Ele
public Ele()
calcDim
public Dimensions calcDim(Dimensions ldim,
Dimensions rdim)
throws ParseException
- Description copied from interface:
BinaryOperatorI
- Find the dimensions of this operator when applied to arguments with given dimensions.
- Specified by:
calcDim
in interface BinaryOperatorI
- Throws:
ParseException
calcValue
public MatrixValueI calcValue(MatrixValueI res,
MatrixValueI param1,
MatrixValueI param2)
throws ParseException
- Description copied from interface:
BinaryOperatorI
- Calculates the value of this operator for given input with results stored in res.
res is returned. Using this method is slightly faster
than the standard run method as it eliminates the construction
of tempoary objects.
- Specified by:
calcValue
in interface BinaryOperatorI
- Throws:
ParseException
run
public void run(java.util.Stack stack)
throws ParseException
- Description copied from class:
PostfixMathCommand
- Throws an exception because this method should never be called under
normal circumstances. Each function should use it's own run() method
for evaluating the function. This includes popping off the parameters
from the stack, and pushing the result back on the stack.
- Specified by:
run
in interface PostfixMathCommandI
- Overrides:
run
in class PostfixMathCommand
- Throws:
ParseException
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