Latex cannot find sty files

Question

I put Rd.sty in C:\texlive\texmf-local\tex\latex\Rd.sty. But when I try to execute a file, say aaa.tex then the error ! LaTeX Error: File "Rd.sty" not found. occur. But, if I put the Rd.sty and aaa.tex in the same directory, then it goes well. Why??

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Answer of my questions by Ulrike Fisher, I reprint here.

1. Put the .sty file, e.g., Rd.sty at C:\texlive\texmf-local\tex\latex\Rd.sty

2. Execute the code mktexlsr from the command prompt to reflect the change as follows:

   C:\Users\User>mktexlsr

Then, we no longer need to put the Rd.sty and some tex file in the same directory.

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We confirm whether LaTeX can detect the .sty file or not via the code kpsewhich style_file_name in the command prompt,

C:\Users\User>  kpsewhich Rd.sty
            <--- Here nothing since LaTeX cannot detect the Rd.sty
C:\Users\User>mktexlsr      <--- Up date
mktexlsr: Updating C:/texlive/2013/texmf-config/ls-R...
mktexlsr: Updated C:/texlive/2013/texmf-config/ls-R.
mktexlsr: Updating C:/texlive/2013/texmf-var/ls-R...
mktexlsr: Updated C:/texlive/2013/texmf-var/ls-R.
mktexlsr: Updating C:/texlive/texmf-local/ls-R...
mktexlsr: Updated C:/texlive/texmf-local/ls-R.
mktexlsr: Updating C:/texlive/2013/texmf-dist/ls-R...
mktexlsr: Updated C:/texlive/2013/texmf-dist/ls-R.
mktexlsr: Done.

>  kpsewhich Rd.sty
c:/texlive/texmf-local/tex/Rd.sty <--- Here LaTeX can detect the Rd.sty