11.7 Traverse all files in a directory
Traverse all files under a specified directory recursively.
According to the following survey table of a primary school’s online learning terminals, calculate proportion of each terminal.
| ID | STUDENT_NAME | TERMINAL |
|---|---|---|
| 1 | Rebecca Moore | Phone |
| 2 | Ashley Wilson | Phone,PC,Pad |
| 3 | Rachel Johnson | Phone,PC,Pad |
| 4 | Emily Smith | PC,Pad |
| 5 | Ashley Smith | PC |
| 6 | Matthew Johnson | Phone |
| 7 | Alexis Smith | Phone,PC |
| 8 | Megan Wilson | Phone,PC,Pad |
| … | … | … |
SPL has directory@s() function to search for files recursively.
SPL script:
| A | B | |
|---|---|---|
| 1 | =directory@ps(“D:/Primary School”) | |
| 2 | >totalCount=0 | |
| 3 | for A1 | =T(A3) |
| 4 | =B3.conj(TERMINAL.split@c())|B4 | |
| 5 | >totalCount+=B3.len() | |
| 6 | =B4.groups(~:TERMINAL;count(~)/totalCount:PERCENTAGE) | |
A1 Traverse all files in the directory and list them.
A2 Define variable totalCount for storing total records.
B3 Import the Excel survey files in loop.
B4 Split each TERMINAL value according to comma and concatenate them to B4’s sequence.
B5 Add number of students in each class to totalCount.
A6 Group B4’s sequence by terminal and calculate proportion of each terminal.
Execution result:
A1:
| Member |
|---|
| D:\Primary School\Grade1\Class1\Investigation.xlsx |
| D:\Primary School\Grade1\Class2\Investigation.xlsx |
| D:\Primary School\Grade1\Class3\Investigation.xlsx |
| … |
B4:
| Member |
|---|
| Phone |
| Phone |
| PC |
| … |
A6:
| TERMINAL | PERCENTAGE |
|---|---|
| PC | 0.7 |
| Pad | 0.567 |
| Phone | 0.933 |
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