How to formulate the following conditional function?
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Consider the following function,f:
if x=0:
f(x)=0
else:
f(x)=sin(1/x)
how to formulate that as a Matlab M-File function?
thanks?
2 个评论
Geoff Hayes
2018-8-26
moh - you state that f is a function but perhaps it is an array instead? are you passing in x to this function and expect to get something returned? Is x an integer or real number? Please provide more details.
moh pouladin
2018-8-26
采纳的回答
Image Analyst
2018-8-26
This works:
function output = f(x)
output = sin(1 ./ x);
% Zero out any values where x is exactly zero.
output(x == 0) = 0;
% Note, this works regardless if x is a scalar or a vector or matrix.
To call it, here is an example:
x = randi(5, 6, 6) - 1
output = f(x)
4 个评论
moh pouladin
2018-8-26
Image Analyst
2018-8-26
编辑：Image Analyst
2018-8-26
Attached is a script that works for scalar, vector, and matrix. Copy and paste into a script, like test.m, like I did with the attached.
clc; % Clear the command window.
clearvars;
close all; % Close all figures (except those of imtool.)
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;fontSize = 22;
% x is a scalar
x = 5
output = f(x)
% x is a vector
x = randi(5, 6, 6) - 1
output = f(x)
% x is a matrix
x = randi(5, 6, 6) - 1
output = f(x)
function output = f(x)
output = sin(1 ./ x);
% Zero out any values where x is negative
output(x == 0) = 0;
% Note, this works regardless if x is a scalar or a vector.
end
To integrate output, you could either sum up the values or use trapz() - whichever algorithm you want.
area = sum(output);
area = trapz(x, output);
moh pouladin
2018-8-27
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