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Let's say I have a vector of 10 elements called numbers in R
numbers <- c(0,1,1,1,0,0,1,0,1,0)
and I want to replace each occurrence of 1 to 5?
this should work
v[v==1]<-5
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I am reviewing a proof at the moment and there is terminology that I do not understand. What does it mean for a polynomial to have "integral coefficients"?
"Integral coefficients" means that the coefficients of your final answer will be integers, unless there is a markedly different context in which the question is being asked.
You can have a look at the definition here.
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I am trying to find out how many combinations are possible for 000 through to FFF under hex format? thanks
There are 16 choices for each of the 3 digits, so:
16*16*16 = 4096
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I have this R code, and i want to assign to the Max Variable the maximum value of A and B
, would be something like :
Max<-(A,B)
How can i do it in R?
I searched but i couldn't find a max function.
Thanks
The function is literally max:
Max <- max(A, B)
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I know that in R, you can index through a list with double brackets, i.e. mylist[[1]]. How do you count the number of elements in that list (not the number of elements in each list item, but the maximum n in mylist[[n]])? I tried NROW, NCOL, dim, among others.
Some example code for the desired behavior of some function num.items(list):
require(testthat)
mylist <- list(array(rnorm(4),dim=c(2,2)),array(rnorm(4),dim=c(2,2)))
expect_that( num.items(mylist), equals(2) )
length?
> length(mylist)
[1] 2
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I have found this formula for computing Pi value:
But I need to compute only(for example - 1000th) number of Pi value. How I can do it with provided formula?
Thanks.
What you want is called a "spigot algorithm". Take a look at [1] in the section "BBP digit-extraction algorithm for pi". Good luck and have fun.
[1] http://en.wikipedia.org/wiki/Bailey%E2%80%93Borwein%E2%80%93Plouffe_formula