Difference between gettablenum and Table() [] []

Question

question

Ruan H asked Oct 12 2021 at 2:20 PM Ben Wilson commented Oct 14 2021 at 1:49 PM

Difference between gettablenum and Table() [] []

i assumed 1&2 have the same meaning, also 3&4.

but in flexsim v2019, 3&4 reported error, but 1&2 are perfectly ok. details showed in foto.

pls, anyone can help me understand the differences, if there are, thanks a lot.

1 int chess_type = gettablenum("ChessInfo" ,row,col);

2 int chess_type = Table("ChessInfo")[row][col]

3 string chess_name =gettablenum("Chess_type " ,chess_type ,2);

4 string chess_name = Table("Chess_type ")[Chess_type ][2]

Software Version:

FlexSim 19.0.0

tables gettablenum

error.png (129.8 KiB)

· 1

Answer 1 · 2021-10-12T17:14:37Z

Ben Wilson answered Oct 12 2021 at 5:14 PM Ben Wilson commented Oct 14 2021 at 1:49 PM

Hi @Ruan H ,

FlexSim version 19.0 supports all the styles of syntax you're using. Here is a model I just used to test (tableCheck.fsm):

Your errors must be occurring in some other aspect of your code. Check your syntax. Check your variable values. Use the debugger to step through your code if you need to.

Good luck!

1634058806430.png (39.1 KiB)

tablecheck.fsm (16.1 KiB)

· 4

Ruan H commented · Oct 13 2021 at 1:43 AM

tablecheck.fsm i have uploaded screenshot of both senario by debugging, also attached model. just want to understand if I did something wrong, or its just system bug.

0 ·

ok-syntax-1013.png (49.1 KiB)

error1013.png (25.3 KiB)

tablecheck.fsm (17.4 KiB)

Ben Wilson ♦♦ Ruan H commented · Oct 13 2021 at 2:37 AM

@Ruan H ,

Here are your problems, given the following code from your sample model:

int chess_type1 = gettablenum("tt",1,1);
print(chess_type1);
string chess_name1 =gettablestr("xx",chess_type1,1);
print(chess_name1);
 
int chess_type1 = Table("tt")[1][1];
print(chess_type1);
string chess_name1 = Table("xx")[chess_type1][1];
print(chess_name1);

You get compile errors on lines 6 and 8 because you can't re-declare chess_type1 and chess_name1. You can re-use the variables, but you can't re-declare them. Just take out the "int" and "string" words, respectively, from lines 6 and 8.

Next, when you successfully run the code you get problems. This is because on line 1, you're reading the value of 0 out of your "tt" table and saving it as chess_type1. Then you use chess_type1 as your row on line 3. But there is no 0 row in a global table. They start at row 1. So you're just trying to read data that doesn't exist.

0 ·

Ruan H Ben Wilson ♦♦ commented · Oct 14 2021 at 4:55 AM

@Ben, thanks a lot for the detail explaination

what really confused me is that when chess_type=0, only command Table() [][] report invalid row num, but if I replace it with gettablenum/string, no error report. as you can see in below foto

question