loglog graph analyses

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kyle lyth
kyle lyth 2012-4-12
hi i have the folowing data i would like to plot in matlab
plotERRLW =
0.0466 0.0111 0.0074 0.0046
NX =
50 500 1000 2000
i am using a logarithmic graph to gain a straight line, if i wished to find the gradient of the line would i use the change in the original numbers or change in the numbers after i have taken a log of them?
(also if i have to take a log of them what base does loglog naturally plot)
i have tried a number of options already but can't seem to get the correct answer (i know it should be close to 2) thanks in advance please ask for any more information kyle

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回答（1 个）

Honglei Chen
Honglei Chen 2012-4-12
loglog uses 10 based logarithm for both X and Y, so if the resulting figure is a straight line and you want to calculate the slope of that line, you need to take logarithm for both X and Y first.
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kyle lyth
kyle lyth 2012-4-12
ahh okay makes a little more sense, however i think there is something wrong with my code as its not produce the answers i am expecting, no worries thanks for your reply :) kyle

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