[Haskell-cafe] Ideas

[Andrew Coppin]

Bertram Felgenhauer wrote:
> Hi,
>
> You wrote:
>   
>> - An interactive function plotter. (GNUplot is nice, but it can't plot 
>> recursive functions...)
>>     
>
> Actually you can express a lot of those with the ?: operator.
>   

Ooo... interesting. I don't recall seeing *that* in the manual!

> gnuplot> f(x) = x < 1 ? 0 : f(x/2) + 1
> gnuplot> plot f(x)
>
> works just as expected. Mutually recursive functions defined that
> way work, too.
>
> Still, support could be a lot better here.
>   

OK... so how do I plot a graph of the Fibonacci numbers?

Similarly, how do I plot (what Haskell calls) interate f 0?