How to create a Histogram of Slope

[Les McElhaney]

Hi,

I would like to create a histogram chart for each activity with the x-axis being slope in % and the y-axis as time.

Thanks in advance,

Les

[Ale Martinez]

There is no builtin chart for this, so your options are: User Chart, R Chart or Python Chart.

[Ale Martinez]

Unless you are already familiar with R or Python my recommendations would be a User Chart, there is an aggregate function handy to create the histogram data explained in the wiki.

[Ale Martinez]

Added this as an example chart since I think it can be illustrative of GC formulas expressiveness (great job, Mark!): https://github.com/GoldenCheetah/GoldenCheetah/wiki/UG_Special-Topics_Working-with-User-Charts#slope-histogram-example-chart 

[Steve Edmonds]

That is very elegant and shows what can be done with good understanding (and reading the Wiki).

A few years ago I was interested in analysing upcoming rides (from others ride data posted on RWGPS) for % of distance within slope bands to target my amount of hill training so created a basic less elegant bar chart with specific bands of interest. Not what the OP wanted (% of time at slope) but possibly of interest.

I also found it useful at times to run Edit>Fix GPS Errors.... if slope data varied unrealistically, frequent in areas of poor GPS reception.

{

finalise {

# we just fetch samples at end

sp <- samples(SPEED);

sl <- samples(SLOPE);

yy <- 100 * c(

sum(sp[sl[i]<=-15.0]),

sum(sp[sl[i]>-15.0 && sl[i]< -10.0]),

sum(sp[sl[i]>-10.0 && sl[i]< -5.0]),

sum(sp[sl[i]>-5.0 && sl[i]< -0.5]),

sum(sp[sl[i]>-0.5 && sl[i]<0.5]),

sum(sp[sl[i]>0.5 && sl[i]<5.0]),

sum(sp[sl[i]>5.0 && sl[i]<10.0]),

sum(sp[sl[i]>10.0 && sl[i]<15.0]),

sum(sp[sl[i]>=15.0])

)/sum(sp);

xx <- c("down lt -15","down -15~-10","down -10~-5","down -5~-0.5","flat","up 0.5~5","up 5~10","up 10~15","up>15");

}

x { xx; }

y { yy; }

}

Steve

On 01/08/2025 01:55, Ale Martinez wrote:

Added this as an example chart since I think it can be illustrative of GC formulas expressiveness (great job, Mark!): https://github.com/GoldenCheetah/GoldenCheetah/wiki/UG_Special-Topics_Working-with-User-Charts#slope-histogram-example-chart  --
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[Ale Martinez]

El jueves, 31 de julio de 2025 a la(s) 6:59:54 p.m. UTC-3, st...@edmondsfamily.co.nz escribió:

That is very elegant and shows what can be done with good understanding (and reading the Wiki).

A few years ago I was interested in analysing upcoming rides (from others ride data posted on RWGPS) for % of distance within slope bands to target my amount of hill training so created a basic less elegant bar chart with specific bands of interest. Not what the OP wanted (% of time at slope) but possibly of interest.

Accumulating time is a special case since count can be used over the slope vector, but the same logic can be used with distance (or work, heart beats, etc.), all you need is to use multisort to keep the vectors aligned before to accumulate.