The RATS Software Forum

I know Display to show REAL or element of SERIES/RECT/VECT; and PRINT to show the whole SERIES.

I read the data from lgdp.txt and data series occur in SERIES WINDow. Also

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display lgdp(1)

shows the first element.

But I also read data from another xls file and series occur in SERIES WINDow too. But

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display XX(1)

shows ##undefined## even though PRINT / XX can show the whole series.

What would be the problem?

That sounds like some type of confusion over the type of XX. You'll have to send the data file and program that are causing problems to support@estima.com so we can look at it.