### Function Reference: `chi2pdf`

statistics: y = chi2pdf (x, df)

Chi-squared probability density function (PDF).

For each element of x, compute the probability density function (PDF) of the chi-squared distribution with df degrees of freedom. The size of y is the common size of x and df. A scalar input functions as a constant matrix of the same size as the other inputs.

Further information about the chi-squared distribution can be found at https://en.wikipedia.org/wiki/Chi-squared_distribution

See also: chi2cdf, chi2pdf, chi2rnd, chi2stat

Source Code: chi2pdf

### Example: 1

     ## Plot various PDFs from the chi-squared distribution
     x = 0:0.01:8;
     y1 = chi2pdf (x, 1);
     y2 = chi2pdf (x, 2);
     y3 = chi2pdf (x, 3);
     y4 = chi2pdf (x, 4);
     y5 = chi2pdf (x, 6);
     y6 = chi2pdf (x, 9);
     plot (x, y1, "-b", x, y2, "-g", x, y3, "-r", ...
           x, y4, "-c", x, y5, "-m", x, y6, "-y")
     grid on
     xlim ([0, 8])
     ylim ([0, 0.5])
     legend ({"df = 1", "df = 2", "df = 3", ...
              "df = 4", "df = 6", "df = 9"}, "location", "northeast")
     title ("Chi-squared PDF")
     xlabel ("values in x")
     ylabel ("density")