Natural log and semi log graph

Question

I am required to take the natural log of a set of values to form a semi log graph and plot them against time (i.e. semi- log y vs x). What does it mean by natural log and how would you do this on the calculator?

e.g. if i wanted to find the natural log of 68 what would it be?

(is it just ln7?)

Answer 1

Natural logarithms are logarithms to base e, and these are usually denoted by ln, as you suggest.

The inverse function to ln is exp, which will probaly appear as e^x on your calculator.

If x = ln(y), then y = e^x.