Why do even the simplest calculators feature a square root key?

05072018, 04:19 PM
Post: #18




RE: Why do even the simplest calculators feature a square root key?
... But it had a reason to be there at the first place, so the relative monetary value doesn't matter in that example. Another point is that if you only have general x^a function and when you do need sqrt(9) you must you need to type: [9][^][0][.][5][accept] or something on those lines, while if you have dedicated square root in a key then that procedure contains two and much more economical calculation.
Lets take an example. I will calculate sqrt(9) in HP50g in RPN mode, I do how ever write the unnecessary zero at the front of decimal point. Case 1  No dedicated square root is used. Key Travel No.Press [9] 0 mm 1 [Ent] 35mm 2 [0] 77mm 3 [.] 91mm 4 [5] 113mm 5 [y^x] 155mm 6 Case 2  Dedicated square root is used. Key Travel No.Press [9] 0 mm 1 [y^x] 45mm 2 The case shows ~70% reduction in finger travel and ~66.5% reduction in key presses. I would say that is pretty significant. This also underlines the importance of the real estate analysis of the keyboard map when engineering such as a calculator keyboard. 

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