Napkin – Notes & Calc

Napkin is a notes app that calculates, on iPhone, iPad and Mac. Write a line, end it with =>, and the result appears behind the arrow. Change a number above it and every result below updates as you type. CALCULATE IN YOUR NOTES • Variables, including names with spaces: rent = 1100, per day = left / 30 => • Your own functions: f(x) = x^2 + 1, then f(4) => • Units and conversions: 26.2 miles in km =>, 50 km/h * 30 min => • Unknown names stay symbolic: 2 * y + 3 * 4 => 2y + 12 EQUATIONS • 6x = 30, then x => 5 – the unknown is solved and defined • Units too: speed * 2 h = 100 km => speed = 50 km/h • Systems: x + y = 10 and x - y = 2 give x = 6, y = 4 • Comments after # stay out of the calculation PLOTS • plot(sin, cos, -pi, pi) draws the curves right under the line • Functions you defined, expressions in x, or a list of numbers SONGS AND THE STAGE VIEW • Chords in brackets, as in ChordPro:…