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Ticket #412 (Fixed)Thu Jul 16 17:10:57 UTC 2015

SciCalc anomalies

Reported by: Bernard Boase (169) Severity: Minor
Part: RISC OS: Application Release:
Milestone: Status Fixed

Details by Bernard Boase (169):

(1) ref. Martin Hansen’s discussion at http://mathmagical.co.uk/Mathematics/CalcPuz.html in which implied multiplication can be misinterpreted by a calculator. Using SciCalc 0.83:

(1.1) 6 ÷ 2 () 1 + 2 () = gives 1
(1.2) 6 ÷ 2 × () 1 + 2 () = gives 9

(1.2) is correct. (1.1) fails to recognise implied multiplication and/or fails to give a warning. Older versions (e.g. 0.65 from ROL under 4.39) give both the correct value of 9.

(2) In drafting the updated User Guide description of SciCalc, I wanted to use the area of a circle, but

(2.1) π × 7 × 7 = gives 153.9380401
(2.2) π × 7 x2 = gives 153.93804
(2.3) π × 7 xy 2 = gives 153.93804

To the available accuracy, I think (2.1) is wrong. Older versions (as above) gives all three the same value of 153.93804.

(3) The button for division has ÷ but the display of the calculation has /. Is the difference deliberate? Similarly the button π shows pi in the display.

Changelog:

Modified by Sprow (202) Sat, July 25 2015 - 07:32:22 GMT

  • Part changed from Unspecified to RISC OS: Application

Modified by Sprow (202) Sun, November 08 2015 - 00:55:43 GMT

  • Status changed from Open to Fixed

Fixed in SciCalc-0_86.

  • Comment on, or change status of, this ticket

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