[Help-glpk] API glp_find_col

[rainly]

My code is very simple as shown below. I use it to test glp_find_col but it
doesn't work.

        const char* p="z[0][0]";
        Col_Num=glp_add_cols(lp,1);
        glp_set_col_name(lp, Col_Num, p);
        Col_Num=glp_find_col(lp, p);

 I debug it step by step. When it goes to the last line, I get debug error. 

glp_find_col: column index does not exist
Error detected in file ...\src\glpapi03.c at line 123

Any suggestions? Thank you in advance.
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