problem with function sinc
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hello everyone
i have a problem with the function sinc (i'm not so expert i started to use mathlab 3 months ago) and i wrote this:
x = 0:pi/100:2*pi;
y=sinc(x);
but i have an error:
Undefined function 'sinc' for input arguments of type 'double'.
someone can help me? thanks
采纳的回答
Adapt its formula as follows:
x = 0:pi/100:2*pi;
y=sin(pi*x)./(pi*x);%sinc function
plot(y)
7 个评论
Jack
2020-3-27
It's also perhaps worth stating that some people (e.g. physicists) define 
as opposed to 
(which is more commonly used in the signal processing community).
as opposed to (which is more commonly used in the signal processing community). 
Birdman
2020-3-27
The OP can adapt the formula according to the need I guess. My aim was to give the idea on implementation.
dert sgt
2020-3-27
yes jack someone uses 
Birdman
2020-3-27
Actually you should be able to use sinc(x) function but I guess you do not have signal processing toolbox or symbolic math toolbox which is required to use sinc(x). So, we have implemented the function according to its formula.
x = 0:pi/100:2*pi;
y=sin(pi*x)./(pi*x);%sinc function
plot(y)
or
x = 0:pi/100:2*pi;
y=sin(x)./x;%sinc function
plot(y)
Jack
2020-3-27
While the singal processing toolbox has sinc() defined explicitly, you can always create a function that does this -- e.g. put the following in a file called sinc.m somewhere in your current path (or in ~/Documents/MATLAB/ or My Documents\MATLAB\)
function out = sinc(x)
% Deal with the removable singularity at 0 explicitly.
out = sin(x)./x;
out(x == 0) = 1;
end
dert sgt
2020-3-27
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