Cos function in simulink

Is there any way I could get a cosine wave source in Simulink rather than just a sine wave?

Answer 1

[Star Strider]

Take the derivative of the sine?

Otherwise: Sine, Cosine (link).

[Oskar]

Thanks for the answer, how would i go about getting the derivative of sine? The goal is to get a cos wave generator like the sin source block.

[Star Strider]

My pleasure.

See: Sine, Cosine (link). You should be able to create a cosine signal directly.

[Oskar]

Thanks, is there a way to edit the amplitude and frequency of the function? i need something like 10cos(181324/20000)

[Star Strider]

Yes.

After you add the block, right-click on it and select Block Parameters (Cos). You can edit them in the GUI that appears.

[Steven Lord]

Another approach is to use a Trigonometric Function block with a couple Gain blocks to operate on the signal coming from a Clock source block.

[Oskar]

When i double click the block i get block parameters cosine but I can only edit the number of points in the lookup table and output word length. When i go through right click > block parameters (subsystem) I get different properties but i can't change anything as it's all greyed out.

[Star Strider]

An even easier way to do it is to select the continuous-time Sin block from Sources, then use Block Parameters (Sin) set the Amplitude, Frequency, and then set Phase to pi/2. That defines a Cosine source!

I did this, and verified it with the Scope block that it was indeed producing a cosine curve.

I have not used Simulink in a few years, and it changed in the last few releases. It took me a while to explore it.

[John D'Errico]

Exactly. Cosine can be viewed as just a phase shifted sine.