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st: Re: two questions about matrix operations

From   "Katsuhide Isa" <[email protected]>
To   [email protected]
Subject   st: Re: two questions about matrix operations
Date   Thu, 06 Jan 2005 19:30:27 +0900

Dear Ulrich,

Thank you for your advice.

2nd question has been solved, thanks to your advice.
As you pointed out, -local- was merely redundant.
Admittedly, I surely made elementary mistakes.
# though some trouble still remains, as mentioned below.

As to the 1st question, when I ran the following, 

>foreach var of varlist A-D{
>	count if `var' == 0
>	local sum = `sum' + r(N)
> }
>di `sum'

following error messages are shown:

Unknown function +r()

Then, I tried the slightly modified statements below:

foreach var of varlist A-D{
	count if `var' == 0
	local i = r(N)
	local sum = `sum' + `i'
di `sum'

But this time, after numbers of zeros for each variable and 
total sum of zeros are vertically shown, following error 
messages appear:
# The same messages are shown after running the statements 
pertaining to the 2nd question.

no; data in memory would be lost

Actually, I try to process multiple dta files using

foreach file in mat1982 mat1983 mat1984{

in the same do file, which might have provoked these messages.

I'd appreciate additional advice.

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