| import math,strutils |
| |
| proc fixedWidth(input: string, minFieldSize: int):string {.inline.} = |
| # Note that field size is a minimum- will expand field if input |
| # string is larger |
| if input.startsWith("-"): |
| return(input & repeatchar(count=(abs(minFieldSize-len(input))),c=' ')) |
| else: |
| return(" " & input & repeatchar(count=(abs(minFieldSize-len(input))-1),c=' ')) |
| |
| template mathOnInterval(lowbound,highbound:float,counts: int,p:proc) = |
| block: |
| var step: float = (highbound - lowbound)/(max(counts,1)) |
| var current: float = lowbound |
| while current < highbound: |
| echo($fixedWidth($current,25) & ": " & $fixedWidth($p(current),25)) |
| current += step |
| |
| echo "Sine of theta from 0 to 2*PI by PI/12" |
| mathOnInterval(0.0,2.0*PI,12,sin) |
| echo("\n") |
| echo "Cosine of theta from 0 to 2*PI by PI/12" |
| mathOnInterval(0.0,2.0*PI,12,cos) |
| |
| # The first example above is much the same as: |
| # for i in 1..100: |
| # echo($sin( (float(i)/100.0) * 2.0*PI )) |
