@Rouben Rostamian  I suppose its too "human crafted" to make a general procedure out of it.

@Rouben Rostamian  

@acer thanks

@tomleslie Tom and Joe and Carl

I assume you're using 2D input. Try it with 1D input

@Carl Love Thanks. So for LambertW(0.4) 

first iteration: --> x=y (keep x and y the same so Ln(1)=0). For Order 3: W(0.4,0.4) = 0.297061159

next iteration: W (0.297061159, 0.4) = 0.2971677 .

good!

@acer But I get "server error" when I tried to download your second file 

@vv Thankyou. It works well. How did you derive your expression?

@acer Thankyou for your efforts. range 0.3<x<30, accuracy 3 digits.

The other thing to remember is excel won't accept a formula too long.

@acer Yes, I wanted to index into the names. Should I change the title?

@brian bovril with vv's help....

Turns out it wasnt a version issue. It took exception to something in my maple.ini file. Specifically it didn't like the declaration e:=exp(1);

@vv When I removed my maple.ini file, your code worked!

 it doesnt like my declaration  e:=exp(1);

interface(prompt=""):
e:=exp(1);
Digits:=15;
print("maple init loaded...");

@vv I get errors when i run this code. M2018.0

@Carl Love 

@Carl Love Maple 2018.0