rank error when calling a nested function.

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1

Hi Everyone,

I noticed a weird scenario relating to nested function call.

q)table:(sym:ab`c;price:4 5 6)

q)func1:{[a;b] {[l;m]select from l where sym=m}[a;b]}

q)func2:{[a;b] {select from x where sym=y}[a;b]}

q)func1[table;b]

sym price

b   5

q)func2[table;b]

{[a;b] {select from x where sym=y}[a;b]}

'rank

q))

Could anybody tell me what’s wrong with func2? Why is it throwing 'rank error? 

2

here x and y when used in a select are not detected as implicit args to the function,

and therefore the function is expecting only a single argument.

You can check which args are expected with

q)0N!value{[x;y]select from x where sym=y};

(0x0ba0a178a20a040005;xy;symbol$();,;0b;,(=;sym;y);?;“{[x;y]select from x where sym=y}”)

q)0N!value{select from x where sym=y};

(0x0ba0a178a20a040005;,x</font>;symbol$();,;0b;,(=;sym;`y);?;“{select from x where sym=y}”)

Hence make those args explicit

q)func2:{[a;b] {[x;y]select from x where sym=y}[a;b]}

q)func2[table;b]

sym price

b   5