How to find out the magnitue of a sinusoidal signal at specific time location.

Hello, I want to find out magnitude of sine wave at specific time location. Is there any way to find out this.

[Vivek Selvam]

How is the sine wave stored?

[Vijender]

for eg. y = sin(t); then y is an array containg all the values an dif you plot(y) you can get sinusoidal wave. so you if you want to store sine wave just store y array. Anyways i got the answer of my question.