| R function |
Matlab function |
What it does... |
|
x<<- | global x | defines x so that it can be called globally |
| x%%y | mod(x,y) | x mod y |
| abs(x) | abs(x) | gives the absolute value of x |
| all(x==a) | all(x=a) | gives a boolean value if all elements of x have the value a |
| any(x==a) | any(x=a) | gives a boolean value if the value a is found |
| apply(x,a,fun) | ? | applies the function fun to x a-wise [eg a=2 is columnwise. fun can be eg all, any, min, max, sum... |
| diag(n) | eye(n) | gives an nxn identity matrix |
| dim(x) | size(x) | gives a (row) vector of the dimensions of x |
for(i in a:b){
statements
} | for i=a:b
statements
end | for loop to repeat statements over index i |
if( condition(s)){
statements
} | if condition(s)
statements
end | a conditional set of statements |
intersect(x,y)
is.element
setdiff(x,y)
union(x,y) | same | set operations |
| length(x) | length(x) | returns the length of a vector x |
| matrix(0,a,b) | zeros(a,b) | creates a matrix of zeroes, of dimension (a,b) |
| matrix(1,a,b) | ones(a,b) | creates a matrix of ones, of dimension (a,b) |
| matrix(x,dim, byrow=F) | reshape(x,size) | reshapes x to have dimension dim (or size) by column |
| nrow(x),ncol(x) | size(x,a) [eg a=1] | number of rows resp. columns of x |
| order(x) | [a b]=min(x) | gives the indices of elements of x in ascending numerical size |
| prod(x) | prod(x) | multiplies all elements of x |
a<-readline("text") | ? | prints text and user input saved into variable |
| solve(a,b) | a/b | gives the solution to Ax=b |
| solve(b,a) | a\b | gives the solution to xA=b |
| sort(x) | sort(x) | sorts the elements of x |
| sqrt(x) | sqrt(x) | square root of x |
| sum(x) | sum(x) | sums the elements of x (whether a vector or matrix) |
| which(x==a) | find(x=a) | gives the indices into x with value a |
while( condition(s)){
statements
} | while condition(s)
statements
end | repeat a set of statements until a condition is met |
| unique(x) | unique(x) | returns x without duplicate entries |