[R] plot level, velocity, acceleration with one x axis

[Spencer Graves]

On 5/30/23 6:16 AM, Eric Berger wrote:
> My code assumes that DAX is a ts object, as in your original post.
> 
> On Tue, May 30, 2023 at 2:06 PM Eric Berger <ericjberger using gmail.com> wrote:
>>
>> Untested but why not
>>
>> a <- cbind(log(DAX), exp(diff(log(DAX))), exp(diff(diff(log(DAX)))))
>> colnames(a) <- c("logDAX", "vel", "accel")
>> plot(a)


	  Progress, but we're not there yet.


a <- cbind(DAX, exp(diff(log(DAX))), exp(diff(diff(log(DAX)))))
colnames(a) <- c("logDAX", "vel", "accel")
plot(a)
plot(a, axes=FALSE, log='y')
axis(1)
axis(2)


	  How do I get each y axis labeled in its original units?  I can use 
pretty to get where I want tick marks, but I don't know where to place 
them "at" in calling axis(2, at= ___)?


(axlb1 <- pretty(range(a[, 1])))
(axlb2 <- pretty(range(log(a[, 2]), na.rm=TRUE)))
(axlb3 <- pretty(range(log(a[, 3]), na.rm=TRUE)))
	

	  This suggests I write my own modification of plot.ts that accepts log 
as a character vector of length = ncol of the ts being plotted and 
returns invisibly a list with the default "at" and "label" arguments 
required to produce the default labeling.  Then a user who wants a log 
scale for some but not all variables can get that easily and can further 
modify any of those scales further if they don't like the default.


	  ???
	  Thanks very much.
	  Spencer Graves
>>
>>
>> On Tue, May 30, 2023 at 1:46 PM Spencer Graves
>> <spencer.graves using effectivedefense.org> wrote:
>>>
>>>
>>>
>>> On 5/29/23 2:37 AM, Eric Berger wrote:
>>>> How about this:
>>>>
>>>> a <- cbind(AirPassengers, diff(log(AirPassengers)),
>>>> diff(diff(log(AirPassengers))))
>>>> colnames(a)[2:3] <- c("percent increase", "acceleration")
>>>> plot(a, xlab="year", main="AirPassengers")
>>>
>>>
>>>            My real problem is more difficult:  I'm analyzing CO2 data from Our
>>> World in Data (https://ourworldindata.org/co2-emissions), and I need to
>>> plot the CO2 data on a log scale but velocity and acceleration on linear
>>> scales.  The following is comparable:
>>>
>>>
>>> str(DAX <- EuStockMarkets[, 'DAX'])
>>> str(DAX. <- cbind(DAX, diff(log(DAX)),
>>>                     diff(diff(log(DAX)))))
>>> colnames(DAX.)[2:3] <- c('vel', 'accel')
>>> plot(DAX.)
>>>
>>>
>>>            I want the first of the three panels to plot on the log scale, but
>>> the other two on linear scales.  The obvious attempt does not work:
>>>
>>>
>>> plot(DAX., log=c('y', '', ''))
>>> #Error in length(log) && log != "" :
>>> #  'length = 3' in coercion to 'logical(1)'
>>>
>>>
>>>            Trying to construct my own axes isn't easy, either:
>>>
>>>
>>> str(logDAX <- cbind(log(DAX), diff(log(DAX)),
>>>                     diff(diff(log(DAX)))))
>>> colnames(logDAX) <- c('logDAX', 'vel', 'accel')
>>> plot(logDAX, axes=FALSE)
>>> axis(1)
>>> axis(2)
>>>
>>>
>>>            I'm thinking of creating my own copy of "plot.ts", and changing it so
>>> it accepts the "log" argument as a vector of length equal to ncol of the
>>> ts object to be plotted AND returning an object that would allow a user
>>> to call "axis" ncol times.
>>>
>>>
>>>            Suggestions?
>>>
>>>
>>>            Thanks,
>>>            Spencer Graves
>>>
>>>>
>>>> HTH,
>>>> Eric
>>>>
>>>>
>>>> On Mon, May 29, 2023 at 7:57 AM Spencer Graves
>>>> <spencer.graves using effectivedefense.org> wrote:
>>>>>
>>>>> Hello, All:
>>>>>
>>>>>
>>>>>             I want to plot level, velocity, and acceleration in three panels with
>>>>> only one x axis.  The code below does this using "layout".  However, I
>>>>> want the three plot areas to be of equal size, and this won't do that:
>>>>> If I stretch the plot vertically, the relative sizes of the three panels
>>>>> changes.  There's probably a way to do this with ggplot2, but I have yet
>>>>> to find it.
>>>>>
>>>>>
>>>>>             Suggestions?
>>>>>             Thanks,
>>>>>             Spencer Graves
>>>>>
>>>>>
>>>>> str(AirTime <- as.numeric(time(AirPassengers)))
>>>>> str(AP <- as.numeric(AirPassengers))
>>>>>
>>>>> def.par <- par(no.readonly = TRUE) # save default, for resetting...
>>>>> (mat3x1 <- matrix(1:3, 3))
>>>>> plot3x1 <- layout(mat3x1, heights=c(1.4, 1, 1.5))
>>>>> layout.show(plot3x1)
>>>>>
>>>>> par(mar=c(0, 4.1, 4.1, 2.1))
>>>>> plot(AirTime, AP, log='y', type='l', axes=FALSE,
>>>>>         main='AirPassengers', ylab='AirPassengers')
>>>>> box(col='grey')
>>>>> axis(2, las=1)
>>>>>
>>>>> par(mar=c(0, 4.1, 0, 2.1))
>>>>> vAP <- diff(log(AP))
>>>>> plot(tail(AirTime, -1), vAP, type='l',
>>>>>         ylab='percent increase', axes=FALSE)
>>>>> box(col='grey')
>>>>> axis(2, las=1)
>>>>>
>>>>> par(mar=c(5.1, 4.1, 0, 2.1))
>>>>> plot(tail(AirTime, -2), diff(vAP), type='l',
>>>>>         ylab='acceleration', xlab='year',
>>>>>         las=1)
>>>>> box(col='grey')
>>>>>
>>>>> par(def.par)
>>>>>
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