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POSubscript out of bounds - general definition and solution?
 

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  1. POSubscript out of bounds - general definition and solution?
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    <p>When working with R I frequently get the error message "subscript out of bounds". <a href="http://sna.stanford.edu/sna_R_labs/lab_2.R">For example</a>:</p> <pre><code># Load necessary libraries and data library(igraph) library(NetData) data(kracknets, package = "NetData") # Reduce dataset to nonzero edges krack_full_nonzero_edges &lt;- subset(krack_full_data_frame, (advice_tie &gt; 0 | friendship_tie &gt; 0 | reports_to_tie &gt; 0)) # convert to graph data farme krack_full &lt;- graph.data.frame(krack_full_nonzero_edges) # Set vertex attributes for (i in V(krack_full)) { for (j in names(attributes)) { krack_full &lt;- set.vertex.attribute(krack_full, j, index=i, attributes[i+1,j]) } } # Calculate reachability for each vertix reachability &lt;- function(g, m) { reach_mat = matrix(nrow = vcount(g), ncol = vcount(g)) for (i in 1:vcount(g)) { reach_mat[i,] = 0 this_node_reach &lt;- subcomponent(g, (i - 1), mode = m) for (j in 1:(length(this_node_reach))) { alter = this_node_reach[j] + 1 reach_mat[i, alter] = 1 } } return(reach_mat) } reach_full_in &lt;- reachability(krack_full, 'in') reach_full_in </code></pre> <p>This generates the following error <code>Error in reach_mat[i, alter] = 1 : subscript out of bounds</code>.</p> <p>However, my question is not about this particular piece of code (even though it would be helpful to solve that too), but my question is more general:</p> <ul> <li>What is the definition of a subscript-out-of-bounds error? What causes it?</li> <li>Are there any generic ways of approaching this kind of error?</li> </ul>
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    1. CO@January has it. It means you're trying to get something, say a column or row, that doesn't exist. For example, say your table has 10 rows and your function tries to call for row 15.
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