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java.lang.Objectjava.util.Observable
org.nfunk.jep.Variable
org.lsmp.djep.xjep.XVariable
org.lsmp.djep.djep.DVariable
public class DVariable
Holds all info about a variable.
Has a name, an equation, a dimension (or sent of dimensions if matrix or tensor)
and also a set of PartialDerivative
.
The derivatives are stored in a hashtable index by
the sorted names of derivatives.
i.e. d^2f/dxdy, and d^2f/dydx will both be indexed by {"x","y"}.
df/dx is indexed by {"x"}, d^2f/dx^2 is index by {"x","x"}.
Partial derivatives are calculated as required by the
findDerivative method.
Field Summary | |
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protected java.util.Hashtable |
derivatives
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Fields inherited from class org.nfunk.jep.Variable |
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name |
Constructor Summary | |
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protected |
DVariable(java.lang.String name)
The constructor is package private. |
protected |
DVariable(java.lang.String name,
java.lang.Object value)
|
Method Summary | |
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java.util.Enumeration |
allDerivatives()
Enumerate all the derivatives of this variable. |
protected PartialDerivative |
createDerivative(java.lang.String[] derivnames,
Node eqn)
|
void |
invalidateAll()
makes value and values of all derivatives invalid. |
static java.lang.String |
makeDerivString(java.lang.String rootname,
java.lang.String[] dnames)
Produces a string to represent the derivative. |
void |
setEquation(Node eqn)
sets the equation |
java.lang.String |
toString(PrintVisitor bpv)
Returns a string rep of variable with its equation and value. |
Methods inherited from class org.lsmp.djep.xjep.XVariable |
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calcValue, getEquation, hasEquation |
Methods inherited from class org.nfunk.jep.Variable |
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getName, getValue, hasValidValue, isConstant, setIsConstant, setValidValue, setValue, setValueRaw, toString |
Methods inherited from class java.util.Observable |
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addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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protected java.util.Hashtable derivatives
Constructor Detail |
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protected DVariable(java.lang.String name)
protected DVariable(java.lang.String name, java.lang.Object value)
Method Detail |
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protected PartialDerivative createDerivative(java.lang.String[] derivnames, Node eqn)
public void setEquation(Node eqn)
setEquation
in class XVariable
public void invalidateAll()
public static java.lang.String makeDerivString(java.lang.String rootname, java.lang.String[] dnames)
rootname
- name of the variable we are calculating the derivative of.dnames
- An array of the names of each of the partial derivatives.
public java.lang.String toString(PrintVisitor bpv)
XVariable
toString
in class XVariable
public java.util.Enumeration allDerivatives()
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