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<h3>Mathematical surface</h3>
<img SRC="surfwin.gif" >
<p>&nbsp;The surface definition is done is the window shown above. The
function are :
<dl>
<li>
'+' : add</li>

<li>
'-' : substract</li>

<li>
'*' : multiply</li>

<li>
'/' : divide</li>

<li>
'^' : power</li>

<li>
'sqrt' : square root</li>

<li>
'sin' : sinus, in degree</li>

<li>
'cos' : cosinus</li>

<li>
'tan' : tangent</li>

<li>
'asin' : arcsinus</li>

<li>
'acos' : arccosinus</li>

<li>
'atan' : arctangent</li>

<li>
'log' : logarithm, base 10</li>

<li>
'ln' : logarithm, base e</li>

<li>
'ceil' : round by</li>

<li>
'floor' : round by default</li>

<li>
'round' : round to nearest integer</li>

<li>
'abs' : absolute value</li>

<li>
'mod' : modulo</li>

<li>
'=' : equality</li>

<li>
'!=' : difference</li>

<li>
'&lt;' : lower</li>

<li>
'>' : greater</li>

<li>
'>=' : lower or equal</li>

<li>
'&lt;=' : greater or equal</li>

<li>
'|' : logical or</li>

<li>
'&amp;' : logical and</li>

<li>
'!' : logical not</li>

<li>
constant : 'pi', 'e'.</li>
</dl>
The result of the equation z = 1 / (x^2 + y^2 + 0.01) is :
<p><img SRC="surfres.gif" >


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