CODEWITHSUNDEEP
rfor-loopplot
user3303937
user3303937

Reputation: 13

Setting y min with variable y max in R plots

I have my data set up to run a dataframe of about 85 columns of species through a for loop to produce one plot per species (samples as rows). Some of them contain only 0 values which plot dots across the middle of the plot (y range (-1, 1)) and I want them at the bottom (y range (0, + value)). The species that do not contain all zeros are scaled to the ymax so I don't want to set the same max for all species as the y variable is quite... variable. Is there a way for me to set a ymin without setting a ymax so that 0 values are always at the bottom of a plot? Thank you in advance!

Upvotes: 0

Views: 4483

Answers (1)

user20650
user20650

Reputation: 25864

Take a punt: You cant set one side of ylim (as far as i know), but as the default limits of ylim are defined as the maximum and minimum of the data, you can just reproduce this behaviour.

# Some example data - its always good to include this in your question
dat <- data.frame(spec1 = 1:10, spec2 = 11:20, spec3 = 0, spec4 = 1:10)

# set plot window
par(mfrow=c(2,2))

# default plot - with no ylim scaling
for(i in names(dat)) { plot(dat[[i]])  }

which gives

enter image description here

Add the ylim. The maximum is taken as the maximum of the data or 1 (or whatever value you want to specify)

for(i in names(dat)) { 
          plot(dat[[i]], ylim=c(min(dat[[i]]), max(dat[[i]],1)))  
     }

Which produces

enter image description here

Notice the limits in the other plots are unchanged

Upvotes: 1

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