Calculate logarithmic scales

I need a javascript algorithm to calculate the position of logrithmic vertical grid lines for an arbitrary number of cycles that don't necessary start at .1 or 1 or 100 etc. I have one currently that will calculate starting at those values, but have a need for a scale that, for instance, starts at .2 to 2000. I've attached a picture that shows the problem. Here is my current algorithm. [login to view URL] = [0.0,0.301,0.477,0.602,0.698,0.778,0.845,0.903,0.954,1.0]; [login to view URL] = function (min, max) { var aryLog = [login to view URL]; var numCycles = [login to view URL](min, max); var aryPercent = [0]; for (var maxLastCycle = 0, i = 0; i < numCycles; i++) { for (var j = 1; j < [login to view URL]; j++) { var val = (maxLastCycle + (aryLog[j] / numCycles)).toFixed(4); [login to view URL](parseFloat(val)); } maxLastCycle = aryPercent[aryPercent.length-1]; } aryPercent[aryPercent.length-1] = 1.0; return aryPercent; } Which for 0.1 to 1000 produces. [0,0.0753,0.1193,0.1505,0.1745,0.1945,0.2113,0.2258,0.2385,0.25,0.3253,0.3692,0.4005,0.4245,0.4445,0.4613,0.4758,0.4885,0.5,0.5753,0.6193,0.6505,0.6745,0.6945,0.7112,0.7258,0.7385,0.75,0.8253,0.8693,0.9005,0.9245,0.9445,0.9612,0.9758,0.9885,1] The attached picture shows my grids over a tiff image of grid lines and they don't match, because the tiff image is calculated from 0.2 to 2.0. That is the problem.