Linspace for logarithmic increasing values

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Peter
Peter 2012-5-21
Hi I'm trying to find out how to make say 100 points, representing a straight line in the loglog-scale.
The line is in theory represented by y=C*x^b, but in my example only start- and end points for the line.
I want to use something like linspace. The increment in x should still be constant. Are there any functions for this? Perhaps a function to find the constant values of C and b.
Best regards Peter
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Wayne King
Wayne King 2012-5-21
I'm confused. A straight line in a loglog() plot comes from a power relationship, not an exponential.
x = 0:0.01:1;
b = 2;
y = 0.5*x.^b;
loglog(x,y)

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回答（1 个）

Wayne King
Wayne King 2012-5-21
Since you are really interested in a power relationship that will produce a straight line in a loglog plot, why can't you use linspace.
x = linspace(0,1,100);
b = 2;
y = 0.5*x.^b;
loglog(x,y)
  2 个评论
Peter
Peter 2012-5-21
Its exactly that "y" im after but in my case the line isn't yet represented by a slope and a constant. The equation is perhaps easy to solve? I thought if there were any built in functions used to produce a discrete logarithmic function, from two points?
Thank you for the help by the way

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