[R] create waveform sawtooth

[Jeff Newmiller]

Ccing the maintainer if the tuneR package. 

Looks to me like sawtooth (and square) don't behave as expected when using xunit="samples". Workaround is to use xunit="time" instead:

sawtooth(110,duration=1/100,samp.rate=sample_rate,xunit="time")

I looked at the code but found it to be opaque.
-- 
Sent from my phone. Please excuse my brevity.

On November 12, 2017 6:15:45 AM PST, Michael Tiemann <mdtiemann at gmail.com> wrote:
>My tuneR sawtooth wave function generator is broken.
>
>When I use the sine function, I get exactly what I expect: a sine wave
>whose frequency is defined by the freq parameter.  In particular,
>higher frequencies have shorter wavelengths (more cycles per second
>means shorter waves).  When I create a sawtooth wave, the opposite
>seems to occur: higher frequencies result in longer waves.  But that’s
>not all: as frequencies increase, it appears that wavelengths increase
>to infinite length, then get shorter again as the wave reverses, then
>it gets longer and flips again.
>
>Here’s a small file that demonstrates the bad sawtooth waves:
>
>library(tuneR)
>
>sample_rate <- 12000
>reverse <- FALSE
>mycolors=c("red","orange","yellow","green","cyan","blue","violet","magenta")
>plot(sawtooth(110,duration=round(sample_rate/100),samp.rate=sample_rate,xunit="samples")@left,type="l")
>freqs <- c(111,112,113,114,115,116,117,118)
>for (i in 1:length(freqs)) {
>temp <-
>sine(freqs[i],duration=round(sample_rate/100),samp.rate=sample_rate,xunit="samples")
>    lines(temp at left,type="l",lty=2,col=mycolors[i])
>}
>
>
>
>
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>
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