How to fix "Undefined function of 'sinc' for input arguments of 'double' type"

% MATLAB script for DSC-SC modulation

clc

clear all

close all

echo on

t0=0.1; % signal duration

ts=0.001; % sampling interval

fs=1/ts; % sampling frequency

fc=250; % carrier frequency

df=1; % desired freq. resolution

t=[0:ts:t0]; % time vector

% message signal

f0=10;

m=sinc(100*t);

Undefined function of 'sinc' for input arguments of 'double' type

Error DSBmod (line 16)

m=sinc(100*t);

How to fix "Undefined function of 'sinc' for input arguments of 'double' type"

[Sriram Tadavarty]

Your code doesn't error when run. Can you once try the example in the documentation page here

https://www.mathworks.com/help/signal/gs/the-sinc-function.html

[Walter Roberson]

Notice that requires the Signal Processing Toolbox.

There is also sinc() in the Symbolic toolbox.