output-formatting

I have a data frame with some very long "comments" columns. When I have them displayed they are broken into different blocks, making it hard to read across rows. Is it possible to change a setting in R or modify the call to data.frame to truncate strings at a certain length? Example: a 3-column dataframe data.frame(cbind(rep(1,5),rep(c("very very long obnoxious character string here" ,"dog","cat","dog",5)),rep(c("very very long obnoxious character string here" ,"dog","cat","dog",5)))) Resulting dataframe as seen on my screen: X1 X2 1 1 very very long obnoxious character string here 2 1 dog 3 1

Typically, Rounding to 2 decimal places is very easy with printf("%.2lf",<variable>); However, the rounding system will usually rounds to the nearest even . For example, 2.554 -> 2.55 2.555 -> 2.56 2.565 -> 2.56 2.566 -> 2.57 And what I want to achieve is that 2.555 -> 2.56 2.565 -> 2.57 In fact, rounding half-up is doable in C, but for Integer only; int a = (int)(b+0.5) So, I'm asking for how to do the same thing as above with 2 decimal places on positive values instead of Integer to achieve what I said earlier for printing . It is not clear whether you actually want to " round half-up ", or

My program (which happens to be in Perl, though I don't think this question is Perl-specific) outputs status messages at one point in the program of the form Progress: x/yy where x and yy are a number, like: Progress: 4/38 . I'd like to "overwrite" the previous output when a new status message is printed so I don't fill the screen with status messages. So far, I've tried this: my $progressString = "Progress\t$counter / " . $total . "\n"; print $progressString; #do lots of processing, update $counter my $i = 0; while ($i < length($progressString)) { print "\b"; ++$i; } The backspace character

The data.table has a nice feature that suppresses output to the head and tail of the table. Is it possible to view / print more than 100 rows at once? library(data.table) ## Convert the ubiquitous "iris" data to a data.table dtIris = as.data.table(iris) ## Printing 100 rows is possible dtIris[1:100, ] ## Printing 101 rows is truncated dtIris[1:101, ] I often have data.table results that are somewhat large (e.g. 200 rows) that I just want to view. The print method of data.table has an argument nrows : args(data.table:::print.data.table) function (x, nrows = 100L, digits = NULL, ...) You can use

I'm having a hard time enabling git colored output on windows when using console2. To trick git I've already SET TERM = 'cygwin'. This enabled the colors from a standard cmd.exe prompt but not in console2. I've verified that console2 can see the env var as well. Anyone know how to get this working? Ok, wow. The solution is to disable custom font color in console2. If enabled, it overrides the expected colors. I use a custom color to give me opaque text when using c2's alpha transparency. I completely forgot about it. VonC That is strange because, with a default installation of console2 (2.00

In C++: int main() { cout << setfill('#') << setw(10) << 5 << endl; return 0; } Outputs: #########5 Is there any setfill() alternative for C? Or how to do this in C without manually creating the string? No, there is no direct alternative. But if you have a well-behaved snprintf (one that behaves as described by the C99 Standard), this works without creating a new string; creating only 2 temporary int s #include <stdio.h> int main(void) { int filler = '#'; /* setfill('#') */ int width = 10; /* setw(10) */ int target = 5; /* 5 */ /* ******** */ int s = snprintf(NULL, 0, "%d", target); for (int i