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# Blog Archives

## My Photo title – UML Activity Diagram

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My Photo caption

## Example of UML notation

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An example of the UML notation, which is widely used for software design and development, especially by software houses and consultancies. Since its creation in late 1990’s, UML has rapidly become the most popular method for software design, replacing a legion of earlier approaches.

James Goode

Tendron Systems Ltd

http://www.tendron.net

## Example R code for graph with two y axes

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Example code to produce a plot with two y axes using R. R is available free from the R CRAN repository.

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# Author: James Goode

# Tendron Systems Ltd

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# Example plot with two y axes

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n = 150 # number of points

y1 = cumsum(rnorm(n))

y2 = cumsum(rnorm(n, mean=0.5))

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```par(mai=c(.9, .8, .4, .8)) # margin size, in inches, c(bottom, left, top, right)

plot(1:n, y1, type="l", col="blue", xlab="X values", main="Plot with two axes")

par(new=TRUE)

plot(1:n, y2, type="l", ann=FALSE, yaxt="n")

axis(4)

legend(x="topleft", bty="y", lty=c(1,1), col=c("blue","red"),

legend=c("Line 1 (left y-axis)", "Line 2 (right y-axis)"))