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Re: case_data_rw()

From: Ben Pfaff
Subject: Re: case_data_rw()
Date: Fri, 14 Apr 2006 10:36:37 -0700
User-agent: Gnus/5.110004 (No Gnus v0.4) Emacs/21.4 (gnu/linux)

Jason Stover <address@hidden> writes:

> I successfully created a variable called residuals with
> dict_create_var_assert (default_dict, "residuals", 0). I'm
> having trouble putting any values in the active file, though,
> and I want to make sure I'm using case_data_rw () correctly:
>       union value *w_val;
>       w_val = case_data_rw (&c, residuals->fv);
>       w_val->f = (*lc->residual) (v_variables, vals, obs, lc, n_variables);
> Should that last line assign the value returned by (*lc->residual) (...)  
> to the value in the current case c? 

This code looks correct and it should have the effect you indicate.

> The LIST command shows nothing but missing values for the new
> variable. And gdb doesn't follow the program in the casereading
> loop, so it's hard to see what's going on. (But I can see
> *lc->residual returns the correct doubles.)

I think there must be some other subtlety that is causing a
problem.  Perhaps you can post the file diff or otherwise
describe the larger context.
Ben Pfaff 
email: address@hidden

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