Thanks to Werner of the hpmuseum forum for his advice on reducing the code by several bytes :-).(c) Takayuki HOSODA, Albert Chan, Werner Huysegomsĭownload ' eW-1.4.raw' for Free42 or DM42 It's nice to be able to handle complex numbers easily with 42S, and thanks to SQRT √ in this equation,Ĥ2S can automatically get the complex y 0 from x less than -1 / e. Or " 1 / 3" from Puiseux series, but 0.3 is quite good enough for this purpose. It can be " e - √2 - 1" which makes zero error at x = 0, Instead of the coefficient of 0.3 in the formula above, So, it is desirable that the approximation error of the initial value is asymptotic to 0 at -1 / e.įor that reason, I chose the following formula as an approximate expression that gives the initial value. It would go bad from a convergence point of view. Or equivalent and simpler, but slightly less accurate recurrence formula below. The Lambert W can be calculated by using e W - the exponent of Lambert W -Į W 0(x) - the exponent of the principal branch of the Lambert W function W 0(x) - can be calculated by using Newton-Raphson method, I downloaded the calculator app and it’s just what I need, thanks for the information.Exponent of Lambert W function for HP 42S for HP 42S Advantage over digital conversions that you can see 'nearest' values at a glance. I have this - printed out and laminated - hanging in my workshop - meets all needs, quick and convenient. While myself and the wife were out doing our normal food shop in Morrisons I wanted a small note book for the workshop to take notes or scribble information on, anyway on the shelf I found a casio fx-85gtx calculator so that has sorted that problem also in B & M I found a small white board and pens with four magnets on thought that would be useful for writing measurements on for quick ref when milling easy wiped off after each use. You can also specify how the spreadsheet will convert decimals that are not an exact equivalent to a fraction to the nearest 1/4, 1/10, 1/16, etc up to 3 digits 1/999. Any decimal you then enter in B2 is converted to a fraction. You can work the other way by formatting A2 as a fraction and entering the formula =B2. Put =A1 in cell B1 and voila it gives you the decimal equivalent, 0.9375 (rounded to 4 decimals places - more if you want). If you have MS Excel either on your phone or PC it easily converts fractions to decimals and back.įor example, format cell A1 as a fraction and enter 15/16. I could have sworn I posted a reply but it seemed to have got lost somewhere Thank you all for the recommendations will have a look at a few of them. Have a look here Calculators Not a perfect answer but these calculators will satisfy most needs. There are versions for Windows, Mac, iPhone, Android, and Linux.ĭerek. However there is an excellent re-creation at: The first serious calculator I used was an HP21 and ever since HP calculators have been my favourite though they stopped making them years ago. If you have an iPad, Derek … This one is excellent: **LINK** Annoyingly for most uses, it does its work in fractions and you need to press the S~D button to convert to everyday decimals. You just need to buy a Casio fx-85GT Plus calculator. Does not need to be a scientific calculator but if by chance it does that would be a bonus. Can anyone recommend an calculator app which can handle fractions and convert them to decimal and also metric.
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