The 2019 IAAF World Rankings document the best performing athletes in the sport of athletics, per the International Association of Athletics Federations (IAAF) individual athlete ranking system. It was the first year that the IAAF used the system. Individual athletes are assigned a points score best on an average of their best recent competition performances. The performance scoring is primarily based on the time or mark of the athlete, plus additional points for their placing within the competition, and some minor modifications based on the conditions. The world rankings are updated each Wednesday. As of 2 October 2019, the number
VisiCalc was the first spreadsheet program but its release for the CP/M operating system ran only on the HP-125, Sharp MZ80, and the Sony SMC-70. SuperCalc was created to fill that void and market opportunity. Alongside WordStar, it was one of the CP/M applications bundled with the Osborne 1 portable computer. It quickly became popular and was ported to MS-DOS in 1982.
An improvement over VisiCalc (though using much the same command structure using the slash key), SuperCalc was one of the first spreadsheet programs capable of iteratively solving circular references (cells that depend on each other's results). It would be over 10 years after the introduction of SuperCalc before this feature was implemented in Microsoft Excel, although in Lotus 1-2-3, manual programming of iterative logic could also be used to solve this issue. According to the SuperCalc product manager, iterative calculations were added when Sorcim changed from binary-coded decimal to binary math. Since the precision of the two math packages was different, some IF statements resolved differently, and iterative calculations helped solve this problem.Versions of SuperCalc were later released for the Apple II, for PCs running MS-DOS, and, after Sorcim was bought by CA Technologies (CA) in 1985, for Microsoft Windows (under the name CA-SuperCalc). SuperCalc was CA Technologies' first personal computer product. The MS-DOS versions were more popular with many users than the market-leading Lotus 1-2-3, because it was distributed without copy protection, as well as being priced lower.