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POHow to make object created within function usable outside
 

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  1. POHow to make object created within function usable outside
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    <p>I created a function which produces a matrix as a result, but I can't figure out how to make the output of this function usable outside of the function environment, so that I could for instance save it in csv file. </p> <p>My code for function is the following:</p> <h2>created function which takes url's from specific site and returns page title:</h2> <pre><code>getTitle &lt;- function(url) { webpage &lt;- readLines(url) first.row &lt;- webpage[1] start &lt;- regexpr("&lt;title&gt;", first.row) end &lt;- regexpr("&lt;/title&gt;", first.row) title &lt;- substr(first.row,start+7,end-1) return(title) } </code></pre> <h2>created function which takes vector of urls and returns n*2 matrix with urls and page titles:</h2> <pre><code>getTitles &lt;- function(pages) { my.matrix &lt;- matrix(NA, ncol=2, nrow=nrow(pages)) for (i in seq_along(1:nrow(pages))) { my.matrix[i,1] &lt;- as.character(pages[i,]) my.matrix[i,2] &lt;- getTitle(as.character(pages[i,])) } return(my.matrix) print(my.matrix)} </code></pre> <p>After running this functions on a sample file from here <a href="http://goo.gl/D9lLZ">http://goo.gl/D9lLZ</a> which I import with read.csv function and name "mypages" I get the following output:</p> <pre><code>getTitles(mypages) [,1] [,2] [1,] "http://support.google.com/adwords/answer/1704395" "Create your first ad campaign - AdWords Help" [2,] "http://support.google.com/adwords/answer/1704424" "How costs are calculated in AdWords - AdWords Help" [3,] "http://support.google.com/adwords/answer/2375470" "Organizing your account for success - AdWords Help" </code></pre> <p>This is exactly what I need, but I'd love to be able to export this output to csv file or reuse for further manipulations. However, when I try to print(my.matrix), I am getting an error saying "Error: object 'my.matrix' not found"</p> <p>I feel like it's quite basic gap in my knowledge, but have not been working with R for a while and could not solve that.</p> <p>Thanks! Sergey</p>
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    1. USSergey Samusev
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    1. COyou have to save it to a variable. `x <- getTitles(mypages)`.
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      1. USArun
 

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