Enrique - 1 year ago 179
R Question

# How do I normalize the Y-axis of histogram between 0 and 1?

I need to normalized the Y-axis of an histogram between 0-1.

This is a part of my data.frame:

``````1.8064 2.2016 2.4506 2.1828 2.1171 1.9308 2.1707 2.1885
2.2310 2.2400 1.9115 2.1527 2.0934 1.7989 2.2144 2.0091
1.9248 2.2038 1.9676 1.9224 1.9502 1.7990 2.0824 2.1300
2.0095 2.0341 1.8433 1.8361 1.9958 1.8243 2.0397 2.0482
2.1143 2.2627 1.7620 1.7561 1.9490 1.9803 1.9336 2.2511
2.2377 2.5414 1.7867 1.6618 2.5090 1.8325 2.0212 2.1616
2.3476 2.1878 2.0469 1.7508 2.2969 1.7939 2.0291 2.0721
2.3534 2.0932 2.3502 1.9960 2.0710 1.9923 1.7787 1.9772
2.2607 2.1504 2.3685 2.1148 2.1961 1.7738 1.8405 2.0135
2.2411 1.9916 2.4726 2.0347 2.0751 1.7570 1.8874 1.9385
2.1913 1.8981 2.2441 2.3068 2.1198 2.1484 1.8056 1.7747
2.0842 1.8750 2.3023 2.1204 1.8972 2.1534 1.8028 1.9401
2.2105 1.9618 2.2472 1.9656 2.3098 1.9771 1.9520 1.8627
2.2863 1.9959 2.1781 1.9544 1.9281 1.9286 1.9699 2.0330
2.1987 2.0583 2.0953 2.0206 2.1148 2.3789 1.7052 1.9145
2.0513 2.0850 1.9810 2.4943 1.9120 2.2209 1.9461 2.0882
2.0049 2.0416 1.9303 2.3681 1.8974 2.0054 1.9261 1.9097
1.6882 2.1196 1.8641 2.3600 2.0931 1.7641 2.1131 1.7748
1.8840 1.7604 1.7664 2.2000 2.0055 1.8229 1.9871 1.9168
1.7340 1.9656 1.8480 2.0523 1.9950 1.8716 1.9206 1.7786
``````

And this is what I'm doing currently:

``````for (i in data){
x <- i

h<-hist(x, plot = FALSE)
h\$density = h\$counts/sum(h\$counts)

plot(h, col="red", xlim = c(0,max(data)))}
``````

But I get this picture:

But what I really want is something like this (Y axis between 0-1):

To scale your Y between `[0,1]` you could use what flodel suggested in this answer

``````maxs <- apply(a, 2, max)
mins <- apply(a, 2, min)
scale(a, center = mins, scale = maxs - mins)
``````

But modifying that code to use only your `y` column:

``````maxs <- max(y)
mins <- min(y)
scale(y, center = mins, scale = maxs - mins)
``````

Hope it helps

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