How an arduino uno read voltage from function generator and oscilloscope?

I have a real time data acquisition project that an arduino uno is connect with an oscilloscope and function generator. Then in Matlab it has to plot a graph in time domain. So, everything that I tune in function generator or oscilloscope, Matlab should show the same thing as from both the oscilloscope and function generator.

[parth pandya]

can you provide diagram of your system.I think for function generator option,you can use ADC(analog channels) of Arduino to take time domain samples of signal and send them on serial port of arduino. Then read data in Matlab from serial port and plot it.However this will not give you too much bandwidth due to speed limitation.