For specifying the number of digits, tipically we use the command **round**, for example:

`round(pi, digits=2)`

[1] 3.14

However, we can also use ** sprintf** command to deal with both the number of digits and the + or – in your equation, for example:

sprinf(“%3.2f”,pi)

[1] “3.14”

`Note that, `

forces the ** 3.2f** controls the number of digits and the symbol

**%**

**+**or

**–**sign in a equation.

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