Retrieving an Element of an Array: Difference between revisions
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(→{{header|Ruby}}: ++ R) |
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aList.pop(0) # Pop first item in a list |
aList.pop(0) # Pop first item in a list |
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'''Note:''' When using the pop() method, the element is removed from the list. |
'''Note:''' When using the pop() method, the element is removed from the list. |
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=={{header|R}}== |
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An element from a vector can be retrieved with the []; slices can be taken using ranges or another vector of indexes. |
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<lang R>a <- 1:10 # create a vector made of number from 1 to 10 |
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print(a[1]) # print the first element |
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print(a[4:6]) # print elements from 4 to 6 |
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print(a[c(1,8, 9)]) # print element 1, 8 and 9</lang> |
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Comma separated indexes can be used to index matrix, e.g. |
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<lang R>a <- matrix(c(1,2,3,4), 2, 2) |
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print(a[2,1])</lang> |
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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