(30b) Lambert w Programme for Solve

[Gerald H]

To find Lambert w function value for X, store X-value in memory 2, enter the programme listed below, exit programme, hold down shift
key & press & release ÷ & release shift key, see the prompt “SOLVE” & enter 1 & before you can say “Hey presto” the value of w is displayed.

Solve for memory 1 given memory 2 value returns w in the equation

X = w * e^w

Similarly, solving for memory 2 given memory 1 value returns the anti-Lambert w value, ie X in the above equation.

0 P6
1 RCL 1
2 Input
3 e^X
4 *
5 RCL-2
6 RTN