PV structure within procedure

Hey there,

I am writing a procedure that needs to compile the global input into a structure to work further with it.

However, I encounter different errors depending on the approach I try. The main issue I have is that if I define a local variable with the name of the structure, the later definition as a structure is an invalid structure redefinition. If I don't define it as a local variable, I cannot use the pvPack and pvUnpack command since the respective variables weren't initialized.

Please see the example below.

proc (1) = example(data);
    local out, subgroups, data_1, data_2;

    struct PV subgroups;
    struct PV out;
    subgroups = pvPack(subgroups, data, "start");

    i = 1;
    do while i <= rows(subgroups.names);
        data_1 = pvUnpack(subgroups, subgroups.names[i]);
        out = pvPack(out,data_1,subgroups.names[i]);

Is there a way to use the pvPack functions within a procedure? Can I somehow call the function without naming the variable before? Or is there another way to add and call elements of a structure within a procedure?

Thanks for any help!

2 Answers


Structures that are declared inside a procedure are local to that procedure. Only weakly typed variables, such as matrices, strings and arrays are declared using the local keyword.

Take a look at this example:


// This is a global structure
struct pv p;
p = pvPack(pvCreate(), 99, "a");

print "The value from GLOBAL 'p' starts =" pvUnpack(p, "a");

// Call proc which sets local 'p'

print "The value from GLOBAL 'p' still =" pvUnpack(p, "a");

proc (0) = pvExample(x);

    // This 'p' is local
    struct pv p;

    p = pvPack(pvCreate(), x, "a");

    print "The value from LOCAL 'p' = " pvUnpack(p, "a");


It will return

The value from GLOBAL 'p' starts =  99.000
The value from LOCAL 'p' =   27.000
The value from GLOBAL 'p' still =  99.000 


Thanks for your quick support!


The pvCreate() in the first call of pvPack did the job (Y)

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