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Why does 2 mod 4 = 2?
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152
Mod just means you take the remainder after performing the division. Since 4 goes into 2 zero ti...
Dynamically update values of a chartjs chart
... on a line chart: http://jsbin.com/yitep/4/edit
Original Post
As of Nov 2013, there seem to be very few options for updating charts.
There is a good example here (duplicated below) of adding new points to a line chart. Still kind of jumpy but not too bad. However, I think the effect probably...
Applying a function to every row of a table using dplyr?
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202
As of dplyr 0.2 (I think) rowwise() is implemented, so the answer to this problem becomes:
ir...
Ruby Bundle Symbol not found: _SSLv2_client_method (LoadError)
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287
I just fixed a similar issue on my system. You need to rebuild your install of Ruby 2.1.2 and ...
How to convert float to int with Java
...ted May 7 '15 at 18:03
user719662
answered Aug 18 '09 at 17:41
tw39124tw39124
8,00722 ...
Summarizing multiple columns with dplyr? [duplicate]
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260
The dplyr package contains summarise_all for this aim:
library(dplyr)
df %>% group_by(grp) ...
How to select the row with the maximum value in each group
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Here's a data.table solution:
require(data.table) ## 1.9.2
group <- as.data.table(group)
If you want to keep all the entries corresponding to max values of pt within each group:
group[group[, .I[pt == max(pt)], by=Subject]$V1]
# Subject pt Event
# 1: 1 5 2
# 2: ...
Remove duplicate elements from array in Ruby
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727
array = array.uniq
uniq removes all duplicate elements and retains all unique elements in the...
How to count the frequency of the elements in an unordered list?
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Formatting a number with exactly two decimals in JavaScript
...ounds my numbers to two decimal places. But I get numbers like this: 10.8, 2.4, etc. These are not my idea of two decimal places so how I can improve the following?
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