# How to represent multiple related signals via mathematical function?

I have three data sets from same source. I know they are interdependent and stochastic also. The datasets are of very high frequency (see the graph, X axis is time and Y axis is value). I want to represent these three signals in a single mathematical function. Is it possible?

In the above graph, please see there is a pattern or seasonality. If we change one then other also changes. I have tried to google for it but did not find any model that can completely represent this type of data in a single expression.

• Welcome to DSP.SE! Mathematical models of signals are very easy to formulate. However, you've said nothing that would allow us to help you with this. Please let us know: Are the signals sine waves? Are they stochastic (random)? Is there any structure at all? What do you mean by "interdependent"? What do you mean by "very high frequency"?
– Peter K.
Sep 22, 2015 at 15:59
• I have edited @Peter-K Hope now it is clearer.
– Kal
Sep 22, 2015 at 16:59
• Thanks! I've reopened. Let's see what people come up with.
– Peter K.
Sep 22, 2015 at 17:00
• What exactly do you want the function to do? Sep 22, 2015 at 17:29
• @JimClay : I want a mathematical expression(s) that represents these three stochastic signals, in other words if I give the input (say we have three signals a,b,c so if we input the value of a,c) then it will produce the result of b at that time quantum.
– Kal
Sep 22, 2015 at 17:48