KDB/k : Functional form to create a table variable

Question

是否存在与以下等效的函数形式？

trades:([]date:`date$();time:`time$();sym:`symbol$();price:`real$();size:`int$(); cond:`char$())

假设函数名是“ct”...

交易:ct[fieldNames;types]

Answer 1

ct:{[fields;types] flip fields!types$\:()}

例子:

q)ct[`date`time`sym`price`size`cond;`date`time`symbol`float`long`symbol]
    date time sym price size cond
    -----------------------------

也适用于 char 形式的类型:

q)ct[`date`time`sym`price`size`cond;"dtsfjs"]
    date time sym price size cond
    -----------------------------