Interpolation of semi-log paper
Interpolation of semi-log paper
(OP)
How do I do a linear interpolation of values on semi-log paper?
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Interpolation of semi-log paper
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RE: Interpolation of semi-log paper
RE: Interpolation of semi-log paper
RE: Interpolation of semi-log paper
If you know what function generated the curve, you should do a nonlinear curve fit.
TTFN
RE: Interpolation of semi-log paper
Maybe try also
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RE: Interpolation of semi-log paper
RE: Interpolation of semi-log paper
For more details, I have posted scans of a couple of pages from my Engineering Graphics textbook on my website (link below). It is near the bottom of the home page. Use of the various types of graphs was emphasized then (1965) since there were few other engineering analysis tools readily available.
As an aside: For the above reason, semilog graphs (both on paper & electronic) are still very popular in study of the stock market. As in the above example, the important issue is the percentage change in value - not whether a stock went up 6 points (first case) or 15 points (second case).
www.SlideRuleEra.net
RE: Interpolation of semi-log paper
Suppose you have avalue X on the log scale between 30 and 40.
The linear dimension from 30 to 40 is e.g. 20 mm and the point X is at 18 mm from the 30 line .
Than X = 30( 40/30)exp18/20
RE: Interpolation of semi-log paper
two points you want to interploate between ...
(X1,y1), and (X2,y2)
then ...
(y-y1)/(y2-y1) = (X-X1)/(X2-X1)
and, as i imagine you're more interested in x ...
x - 10^X