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<HTML>
<HEAD>
<TITLE>Expressions</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" TEXT="#000000">
<P><A NAME="expression"></A>
<font size="+3" color="green"><B>Expressions</B></font></P>
<P>
An expression is some combination of constants, variables, functions, and operators. For example:</P>
<p>
<font color="blue"><PRE>
A*COSD(X/10)+3.5*SIND(X/12)+C*EXP(-X)</PRE></font></p>
<P>
Input is limited to <code>255</code> characters, so to have expressions
that are longer, use character variables to store its pieces and the <code>
<a href="../Functions/StringManipulation/eval.htm">EVALUATE</a></code> function to
evaluate the expression numerically. For example:</P>
<font color="blue"><PRE>
F1 = '2.5*COS(X/10)+3.5*SIN(X/12)+63.7*EXP(X/45)'
F2 = '1.234567*MOD(X,100)+SIN(X/1000)*EXP(X/200)'
F3 = '3.56789*X^2-2.34567*X+23.456'
F = 'F1+F2+F3'
Y = EVALUATE(F)
</PRE></font>
<p>
You can use the <code><a href="../Functions/StringManipulation/expand.htm">EXPAND</a></code>
function to expand all the parts of a string. For example, with the above variable definitions,
<font color="blue"><CODE>=EXPAND(F)</CODE></font> will display:</P>
<font color="blue"><PRE>
(2.5*COS(X/10)+3.5*SIN(X/12)+63.7*EXP(X/45))+(1.234567*MOD(X,100)+SIN(X/1000)*EXP(X/200))+(3.56789*X^2-2.34567*X+23.456)
</PRE></font>
<P>
<a href="assignments.htm"><font size="+1" color="olive">Assignments</font></a><br />
<a href="characterassignment.htm"><font size="+1" color="olive">String assignments</font></a><br />
<a href="characterarray.htm"><font size="+1" color="olive">String arrays</font></a><br />
<a href="evaluations.htm"><font size="+1" color="olive">Evaluations</font></a>
</P>
<P>
<a href="indices.htm"><img src="../shadow_left.gif">
<font size="+1" color="olive">Indices</font></a><br />
<a href="colors.htm"><img src="../shadow_right.gif">
<font size="+1" color="olive">Colors</font></a>
</P>
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