Swirl()笔记

本文介绍了R语言中常用的逻辑及统计函数,包括用于逻辑判断的isTRUE(), identical(), xor()函数;用于样本抽取的sample()函数;以及用于索引查找的which()函数等。此外还介绍了用于检查逻辑向量的any()和all()函数,以及计算平均值的mean()函数。

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isTRUE()

| The function isTRUE() takes one argument. If that argument evaluates to TRUE, the function will return TRUE. Otherwise, the
| function will return FALSE. Try using this function by typing: isTRUE(6 > 4)

indentical()

| The function identical() will return TRUE if the two R objects passed to it as arguments are identical. Try out the
| identical() function by typing: identical('twins', 'twins')

xor()

 The xor() function stands for exclusive OR. If
| one argument evaluates to TRUE and one argument evaluates to FALSE, then this function will return TRUE, otherwise it will
| return FALSE. Try out the xor() function by typing: xor(5 == 6, !FALSE)

sample()

sample takes a sample of the specified size from the elements of x using either with or without replacement.

which() Any()

The which() function takes a logical vector as an
| argument and returns the indices of the vector that are TRUE.
| Like the which() function, the functions any() and all() take logical vectors as their argument. The any() function will
| return TRUE if one or more of the elements in the logical vector is TRUE. The all() function will return TRUE if every
| element in the logical vector is TRUE.

mean()

| The mean() function takes a vector of numbers as input, and returns the average of all of the numbers in the input vector.
| Inputs to functions are often called arguments. Providing arguments to a function is also sometimes called passing arguments
| to that function. Arguments you want to pass to a function go inside the function's parentheses. 

paste {base}

Concatenate vectors after converting to character.
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