Short description
piely(x,txt)
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piely(x,txt): the txt vector allows to write a text for each part of the pie, the ith component of txt corresponds to the ith part (default : it's written the percentages which corresponds to the parts surface). The size of txt must be equal to N.
if size of x is N then pie function draws a pie with N parts, the area of the ith part is equal to (x(i)/sum(x))*( surface of the unit circle).