fsurfht
Interactive contour plot
Syntax
fsurfht(fun,xlims,ylims)
fsurfht(fun,xlims,ylims,p1,p2,p3,p4,p5)
Description
fsurfht(fun,xlims,ylims)
is
an interactive contour plot of the function specified by the text
variable fun
. The x-axis limits
are specified by xlims
in the form [xmin xmax]
, and the y-axis limits
are specified by ylims
in the form [ymin ymax]
.
fsurfht(fun,xlims,ylims,p1,p2,p3,p4,p5)
allows
for five optional parameters that you can supply to the function fun
.
The intersection of the vertical and horizontal reference lines on the plot defines the current x value and y value. You can drag these reference lines and watch the calculated z-values (at the top of the plot) update simultaneously. Alternatively, you can type the x value and y value into editable text fields on the x-axis and y-axis.
Examples
Plot the Gaussian likelihood function for the gas.mat
data.
load gas
Create a function containing the following commands, and name
it gauslike.m
.
function z = gauslike(mu,sigma,p1) n = length(p1); z = ones(size(mu)); for i = 1:n z = z .* (normpdf(p1(i),mu,sigma)); end
The gauslike
function calls normpdf
, treating the data sample as fixed
and the parameters µ and σ as variables. Assume that the
gas prices are normally distributed, and plot the likelihood surface
of the sample.
fsurfht('gauslike',[112 118],[3 5],price1)
The sample mean is the x value at the maximum, but the sample standard deviation is not the y value at the maximum.
mumax = mean(price1) mumax = 115.1500 sigmamax = std(price1)*sqrt(19/20) sigmamax = 3.7719
Version History
Introduced before R2006a