loads a csv file to the Div format
x_dvi = csv2div('mycsvdata',(field),(decimal));
the name of a csv file (a string)
the csv file must respect the following format:
the first line of mycsvdata.csv contains the labels of the columns
the first column of mycsvdata.csv contains the labels of the lines
note: the value in first line and first column is dropped
the field separator (optionnal)
by default: semi-column ';'
the decimal separator (optionnal)
by default: comma ',' or dot '.'
a Div structure
x_div.d contains the data matrix
x_div.i contains the labels of the observations (lines)
x_div.v contains the labels of the variables (columns)