Created
June 5, 2019 20:11
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Rounding up and rounding down to the nearest order of base 10 magnitude.
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// Some example code for rounding up and rounding down to the nearest order of base 10 magnitude. | |
// Thanks to this thread for pointing me in the right direction | |
// https://stackoverflow.com/questions/7906996/algorithm-to-round-to-the-next-order-of-magnitude-in-r | |
void setup() { | |
int i = 1200; | |
println("i = "+ i); | |
println("---"); | |
println("log(i): "+log(i)); | |
println("log10(i): " + log10(i)); | |
println("---"); | |
println("ceil(log10(i)): " + ceil(log10(i))); | |
println("floor(log10(i)): " + floor(log10(i))); | |
println("---"); | |
println("pow(10, ceil(log10(i))): " + pow(10, ceil(log10(i)))); | |
println("pow(10, floor(log10(i))): " + pow(10, floor(log10(i)))); | |
/* | |
i = 1200 | |
--- | |
log(i): 7.090077 | |
log10(i): 3.0791812 | |
--- | |
ceil(log10(i)): 4 | |
floor(log10(i)): 3 | |
--- | |
pow(10, ceil(log10(i))): 10000.0 | |
pow(10, floor(log10(i))): 1000.0 | |
*/ | |
} | |
// Calculates the base-10 logarithm of a number | |
float log10 (int x) { | |
return (log(x) / log(10)); | |
} |
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