https://bugs.kde.org/show_bug.cgi?id=495232
--- Comment #10 from Wolfram Klaus <wolfram.kl...@fu-berlin.de> --- (In reply to Gabriel Barrantes from comment #9) > (In reply to Wolfram Klaus from comment #6) > > (In reply to Gabriel Barrantes from comment #4) > > > Created attachment 175147 [details] > > > show keys on genome calculator > > > > OK, found it and could reproduce that gnome-calculator gets it wrong, too. > > Kcalc at least gets it right with builtin constants. Try typing this on the > > keyboard to play with Planck's constant > > h -> 6,62607015e-34 > > h/h -> 1 > > > > It even works if you assign Planck's constant to a Button, so that pressing > > the button inserts its value > > > > (see attachments) > > yeah, as I said, using "e" or "E" works fine, but is not the same as "*10^", > so is not a bug, we could change it to be "e" instead of "*10^" but let's > wait if someone else reports the issue. > For now you can just focus the input display (click on it) and type "e". OK, focussing the input display and using e works as I expect it. Thank you very much. Now I can work with kcalc like I used to. Following are some thoughts you might consider or not even read;-) History of the button: Desktop calculators eg. from Casio, TI, etc. used to have a button for entering scientific notation, which was labeled "EE" or "EXP" for decades. About 10-15 years ago they changed the label of the button to "·10^x", probably to be more student friendly. The meaning stayed the same. Usage of the button: I as a physics teacher use and tell my students to use this button a) to enter big or small numbers like the mass of the earth or of an oil drop in Millikan's experiment and b) to enter values with SI prefixes like 1.8 GHz or 632.8 nm. When working with formulae such as Newton's F=GmM/r² with r=149.6·10^9m it is nice, when this value is treated as one number like on a Casio, TI, etc. Actually I have never come across a use case, where I wanted to divide one number by another and multiply the result by a pure power of 10. In such a case, what kcalc and gnome calculator do right now would indeed be handy. I think the reason why calculators have have this button and not a "·9^x" or a "+3)·x" button, is because it is intended for entering scientific notation and not as a shortcut... Mathematical correctness: No doubt, you are mathematically correct. On the other hand there is this thing with SI prefixes: 1km² are per definition 10^6m² which actually contradicts order of precedence, but it is the way powers of units with SI prefixes are handled. One might consider the Interpretation of button as in line with this. What to do? a) I am happy with the solution you gave me. So you can close this bug report (if no one else reports this issue, as you said) b) Change the behavior and wait if someone reports a bug;-) c) Make the behavior configurable d) Offer both buttons Oh, and thanks for your work on Open Source Software! -- You are receiving this mail because: You are watching all bug changes.
