![]() ![]() ![]() A conditional expression is used to compute the correct result for negative arguments (the machine must be in radians mode also note the difference between minus signs, '-', and subtraction signs, '−'): Ans→X: The program below, intended to demonstrate the fx-4000P's programming model, uses the Lanczos-approximation to accurately compute the logarithm of the Gamma function. At last! (Well, I did have a German manual and the English manual for the EC-4020, but it's not quite like the real thing.) I must say, it is still a lovely, very capable machine my only two complaints are the somewhat hard to read display and a less than ideally robust construction. In 2012, some 13 years after I received my first EC-4020 and 11 years after I came across the first fx-4000P, a kind calculator owner, Aron from NJ sent me his old fx-4000P, this time with an English manual. ![]() At the time, I did not yet know about the fx-4000P model number, so the find represented a bit of a mystery. I first came across the fx-4000P in its OEM guise as the Radio Shack EC-4020. ![]() They just don't make machines like this anymore! With a full set of scientific functions and a whopping 550-step program memory, this is definitely a serious engineering tool. This is a no-compromise, high-end, classic programmable. After initially offering such marvellous calculators as the fx-201P or the FX-602P, Casio went steadily downhill most of their later programmable models have extremely limited programmability, both in terms of capacity and in terms of functionality. ![]()
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