<div><font size="4">when we try to calculate the cube root of -27 (using the formula = POWER (A1, 1/3) -3 Calc should give us but gives us the message # VALUE!</font></div><div><font size="4">I solved the problem by modifying the formula as follows:</font></div>
<div><font size="4">=-POWER (-A1, 1/3) and this modification Calc can give us the correct answer.</font></div><div><font size="4">Well I think to include this modification in Cal would take a decision block, suppose that the entries are "numbers, index". The terms of the decision would be:</font></div>
<div><font size="4">if (num <0 & 1/index% 2 = 1)</font></div><div><font size="4">The first one test if num is a negative number, the second one trys if index is an odd number, yet if an integer. If true both conditions would be used if the proposed amendment and was not used the normal function.</font></div>
<div><font size="4">If this helps please let me know. I hope not look like a fool. If Cal can do the calculation differently let me know as it does, thanks for everything.</font></div>