 # Lession - #926 R Pie

##### Pie Charts
A pie chart is a circular graphical view of data.
Use the
``pie(>``
function to draw pie charts:
###### Example
# Create a vector of pies
x <- c(10,20,30,40>

# Display the pie chart
pie(x>
Result: #### Example Explained

As you can see the pie chart draws one pie for each value in the vector (in this case 10, 20, 30, 40>
.
By default, the plotting of the first pie starts from the x-axis and move counterclockwise.
Note: The size of each pie is determined by comparing the value with all the other values, by using this formula:
The value divided by the sum of all values:
``x/sum(x>``

Use the
``label``
parameter to add a label to the pie chart, and use the
``main``
###### Example
# Create a vector of pies
x <- c(10,20,30,40>

# Create a vector of labels
mylabel <- c("Apples", "Bananas", "Cherries", "Dates">

# Display the pie chart with labels
pie(x, label = mylabel, main = "Fruits">
Result: ##### Colors
You can add a color to each pie with the
``col``
parameter:
###### Example
# Create a vector of colors
colors <- c("blue", "yellow", "green", "black">

# Display the pie chart with colors
pie(x, label = mylabel, main = "Fruits", col = colors>
Result: ##### Legend
To add a list of explanation for each pie, use the
``legend(>``
function:
###### Example
# Create a vector of labels
mylabel <- c("Apples", "Bananas", "Cherries", "Dates">

# Create a vector of colors
colors <- c("blue", "yellow", "green", "black">

# Display the pie chart with colors
pie(x, label = mylabel, main = "Pie Chart", col = colors>

# Display the explanation box
legend("bottomright", mylabel, fill = colors>
Result: The legend can be positioned as either:
``````bottomright,

bottom,

bottomleft,

left,

topleft,

top,

topright,

right,

center``````