[ferret_users] bad value problem

[golla nageswararao <ezeenag4u@xxxxxxxxx>]

Hi,

  I am having a problem regarding bad value resulting from a defined variable. i.e.,

1) mld=dd[z=@loc:0]

2) mld_t=temp[z=`mld`]

If the first statement results no answer, i.e, ...... Then it is not able to define the second variable and showing error, "unkown bad". How to invoke ferret to skip to compute mld_t whenever mld value results in null value ? or otherwise how to overcome this problem?

Thanks in advance.

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With best regards,
 G.NageswaraRao.