Arbitrary Operations (functions etc.) on each item in a list

miguello

Is there a more simple way of applying the same function on each item of a list rather than iterating through a list?

For example:

stringlist = {"1", "2"};
numericlist = {};
for (i = 1, i<=N Items(stringlist), i++,
	numericlist[i] = Num(stringlist[i])
	
);
show(numericlist);

Is there something simpler, something like just saying:

numericlist = Num(stringlist);

but this obviously doesn't work. Any other way?

P.S. Just found For Each function new in JMP 16, unfortunately, I'm still on JMP 15

jthi

As you have already noticed JMP16 will help with this one with For Each and Transform Each. If you have to do this many times, maybe you could create custom functions to perform the tasks?

 

Names Default To Here(1);

charToNum = function({tempList}, {Default Local},
	newList = {};
	For(i = 1, i <= N Items(tempList), i++,
		newList[i] = Num(tempList[i]);
	);
	return(newList);
);

a = {"1", "2"};
b = charToNum(a);
show(b);

 

Edit:

You can also create more complicated function which could handle different transformations. Most likely will be overkill and I wouldn't really recommend it (I would just create different functions for different transformations).

 

Here is one example how it could be done:

Names Default To Here(1);

transformList = function({tempList, transformExpression}, {Default Local},
	newList = {};
	For(i = 1, i <= N Items(tempList), i++,
		val = tempList[i];
		newList[i] = transformExpression
	);
	return(newList);
);

a = {"1", "2", "100"};
b = transformList(a, Expr(Num(val)));
c = transformList(b, Expr(Multiply(val, 10)));
d = transformList(c, Expr(Char(val)));
Show(a,b,c,d);


//can also use custom functions with transformList
padZero = function({tempValue}, {Default Local},
	if(Length(tempValue) < 2,
		tempValue = "0" || tempValue;
	);
	return(tempValue)
);
e = transformList(a, Expr(padZero(val)));
Show(e);
f = transformList(e, Expr(Length(val)));
Show(f);