How can I multiply 2 signals?

I tried to plot the graph of product of 2 signals (Cosine and and decaying exponential) but am getting an error

x = (-100 :.05 :100);
y = cos(2*pi*x).exp(-x);

Dot indexing is not supported for variables of this type.

plot(x,y);
figure ;
title('Task-4 Cosine mutliplied with decaying exponential signal');
xlabel('Time');
ylabel('Amplitude');

[RandomChikiBum]

And how can I multiply the power of the exponent with a constant?

like e^(-5x) or using decimal numbers?

Answer 1

[DGM]

Something like

x = (-1 :.05 :1); % pay attention to scale and limits
y = cos(2*pi*x).*exp(-5*x); % elementwise multiply with .*

plot(x,y);
title('Task-4 Cosine mutliplied with decaying exponential signal');
xlabel('Time');
ylabel('Amplitude');