Re: [R] rectify a program of seasonal dummies matrix
Friedrich Schuster wrote:
Hello,
the main problem seems to be the if else, should be else if.
Your code is hard to read, maybe you should consider using more () {}:
T - 100;
br - matrix(0,T,4);
Thanks for the contribution. Please note:
a) It is a bad idea to have a variable called T. Some people still use
it as a logical value even if they should not.
b) R does not need any ; at the end of a line.
Uwe Ligges
for (i in 1:T) {
for (j in 1:4) {
if (i==j) {
br[i,j] - 1;
}
else if ((abs(i-j)%%4)==0) {
br[i,j] - 1;
}
else {
br[i,j] - 0;
}
}
}
A simpler approach is creating a diagonal matrix and multply it :
# create small diagonal matrix
mat = diag(x=1, nrow=4, ncol=4);
mat
# multiply diagonal matrix and re-dimension it to 4 cols
br - rep(mat, 25);
dim(br) - c(100, 4);
br;
Hope this helps,
FS
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Re: [R] rectify a program of seasonal dummies matrix
Your syntax is wrong; e.g.,
if i==j
should be
if (i == j)
same with your use of 'if else'. You need to use the correct syntax.
Your example is hard to follow without the correct indentation since
you are using the incorrect syntax.
On 8/21/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
Hi friends,
I would like to construct a matrix of seasonal dummies with number of rows
(observations)=100. such matrix is written as follows:[1 0 0 0;0 1 0 0;0 0 1
0;0 0 0 1;1 0 0 0;0 1 0 0;0 0 1 0;0 0 0 1;etc...] . I wrote the following
program:
T=100
br=matrix(0,T,4)
{
for (i in 1:T)
for (j in 1:4)
if i==j
br[i,j]=1
if else (abs(i-j)%%4==0
br[i,j]=1
else
br[i,j]=0
}
z-br
z
but unfortunately I obtained from the console the following message:
{
+ for (i in 1:T)
+ for (j in 1:4)
+ (if i==j)
Erreur : syntax error, unexpected SYMBOL, expecting '(' dans :
br[i,j]=1
Erreur dans br[i, j] = 1 : objet i non trouvé
(if else (abs(i-j)%%4==0)
Erreur : syntax error, unexpected ELSE, expecting '(' dans (if else
br[i,j]=1
Erreur dans br[i, j] = 1 : objet i non trouvé
else
Erreur : syntax error, unexpected ELSE dans else
br[i,j]=0
Erreur dans br[i, j] = 0 : objet i non trouvé
}
Erreur : syntax error, unexpected '}' dans }
Can you please rectify my smal program, I tried to rectify it but I can't.
Many thanks in advance.
[[alternative HTML version deleted]]
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and provide commented, minimal, self-contained, reproducible code.
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem you are trying to solve?
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Re: [R] rectify a program of seasonal dummies matrix
Hello,
the main problem seems to be the if else, should be else if.
Your code is hard to read, maybe you should consider using more () {}:
T - 100;
br - matrix(0,T,4);
for (i in 1:T) {
for (j in 1:4) {
if (i==j) {
br[i,j] - 1;
}
else if ((abs(i-j)%%4)==0) {
br[i,j] - 1;
}
else {
br[i,j] - 0;
}
}
}
A simpler approach is creating a diagonal matrix and multply it :
# create small diagonal matrix
mat = diag(x=1, nrow=4, ncol=4);
mat
# multiply diagonal matrix and re-dimension it to 4 cols
br - rep(mat, 25);
dim(br) - c(100, 4);
br;
Hope this helps,
FS
--
Friedrich Schuster
mail at friedrich-schuster.de
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
