fplot command what is the default resolution ?

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tomer polsky
tomer polsky 2019-4-28
回答： dpb 2019-4-28
lets say i have this code :
clc; clear all;
close all;
x=0:0.1:5;
f='3*exp(-x).*sin(x)';
fplot(f,[0 8],'b') title(f) xlabel('x') ylabel('y') grid on;
I am a bit counfused with this fplot command ? becouse the the [0 8 ] means the the plot is betwen 0 to 8 how ever what is the size of axes x ? if I will use plot command then I have X and Y ,and X is a vector however in the flpot command my X is not a vector but an array ... how is this possible ?

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回答（1 个）

dpb
dpb 2019-4-28
clear x
f=@(x) 3*exp(-x).*sin(x);
fplot(f,[0 8],'b')
will produce the same plot -- fplot doesn't use your x array at all; it computes x internally and uses a number of points dependent upon the range given to provide (hopefully) a smooth plot. Try
hAx=gca;numel(hAx.Children.XData)
afterwards if you change the range or use the default range and see what you get...
Also NB: the string form for the functional is deprecated usage; use the alternate function handle instead.

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