Using functions to create a function

I want to create 2 functions called ADX and ADXR (ADXR uses ADX to calculate itself). This is the function for ADX-

function [ adx ] = adx( t, p )
    adx(i) = [adx(i-t)*(p-t)+DX)]/p
end

Is this the correct way to program the function for ADXR?

function [ adxr ] = adxr( p )
    adxr(i) = [adx(i) + adx(i-p)]/2
end

Or does it need the input arguments of adx -"adx(t,p)"? If so, how do I tell matlab I want the previous adx value and not the current value?

function [ adxr ] = adxr( p )
    adxr(i) = [adx(t, p) + adx(i-p)(t,p)]/2
end

[Walter Roberson]

Do not name a variable the same thing as your function name: there is too much chance of accidentally getting recursion.

[Image Analyst]

Maybe he's an old Visual Basic programmer, where it does it that way.

Answer 1

[Walter Roberson]

In your line

adx(i) = [adx(i-t)*(p-t)+DX)]/p
end

because "i" is not a parameter to the function and is not a variable you initialize, "i" is going to default to sqrt(-1) . If your code managed to get anywhere, it would fail because you cannot index an array at sqrt(-1)

Answer 2

[Image Analyst]

Maybe something like this:

function adxrOutput = adxr( p, i )
    adxrOutput  = [adx(i) + adx(i-p)]/2
end

function adxOutput = adx(t, p, i)
    adxOutput  = [adxOutput(i-t)*(p-t)+DX)]/p
end

I'm not sure I follow what you're trying to do though, and in the adx function, it's still not going to work (even though I made the output variable separate from the function name), but I don't know how to fix it because you haven't said what you want to do.