MATLAB: How I can write this expression of summation in Matlab

MATLABsignalsum

t=-200:1:200; 
k=linspace(-9,9,numel(t))
S1 = 1i/4.*cumsum((sinc((k+2/2))-sinc((k-2)/2)).*exp(1i.*10.*pi.*k.*t) )
plot(t,S1)

easy peasy:

t = -2:0.01:2;
T = 2;
y = 2*sinc(2*T*t) + sinc(2*T*t+1) + sinc(2*T*t-1);
plot(t, y)

sinc() function is defined in Signal Processing toolbox.

If you don't have the toolbox, then you can define it like this

function y = sinc(x)
    y = sin(pi*x)./(pi*x);
    y(x==0) = 1;
end

A = @(c) sqrt(m/(2*pi*k*T1))*exp(-m/(2*k*T1)*(c-c_bar1)^2)
q = integral(A,-inf,inf)