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st: Re: generating a matrix


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: generating a matrix
Date   Mon, 22 May 2006 08:20:49 -0400

describing are ordinary Stata variables. If you really want to repeat scalars 326 times, then

gen input1 = 33.12
gen input2 = 156
gen input3 = 227.8

And if you want the sum of a variable, there are a couple of ways to do it.

egen tot1 = total(input1)

will place the total of all values of input1 (in this case, 326 * 33.12) in a new variable. That is a very wasteful use of memory. You could also do

summarize input1, meanonly
scalar tot1 = r(sum)

which would place the same total into a scalar.

Kit Baum, Boston College Economics
http://ideas.repec.org/e/pba1.html


On May 22, 2006, at 2:33 AM, Gauri wrote:


I realised that i was not very clear with my question and my sincere
apologies.

I will try and be clear.

1. First of all, both of you are correct. I want to generate the following
input price matrix (not vector) with 326 rows: Input1, Input2 and Input3 are
values that I have calculated elsewhere and would like to insert these to
look like

input1 input2 input3
33.12 156 227.8
33.12 156 227.8
33.12 156 227.8
.
.
.
.
.
until the 326th row.

So I am requesting information on how to generate this matrix.

2. I would like to add the column values from 1 to n(=326). What should I
look for in help to generate this. This is what I would like to do

Plot Area
1 2
2 10
3 5.5
4 22
5 3

Generate Totalarea(a scalar?)=2+10+5.5+22+3=47.5

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