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POR multiple conditions in row selection of matrix
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copied!<blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/6933598/r-subset-logical-and-operator-for-combining-conditions-should-be-not">R: subset() logical-and operator for combining conditions should be & not &&</a> </p> </blockquote> <p>I have a simple question, but I don't know how to solve this... I want to select all rows where value_1 > 0 and value_2 > 0. Now I have this code:</p> <pre><code>dataOnBoth<-data[data$value_1 > 0,][data$value_2 > 0,] </code></pre> <p>When I head this data, ordering on log2_fold_change, I have This output:</p> <pre><code>gene_id sample_1 sample_2 status value_1 value_2 log2_fold_change 86 uc001aen.1 q1 q2 NOTEST 0.0619347 0 -1.79769e+308 150 uc001ahx.1 q1 q2 NOTEST 0.0432199 0 -1.79769e+308 186 uc001ajk.1 q1 q2 NOTEST 0.0854541 0 -1.79769e+308 251 uc001amf.1 q1 q2 NOTEST 0.0636211 0 -1.79769e+308 358 uc001are.3 q1 q2 NOTEST 0.3642040 0 -1.79769e+308 394 uc001ass.1 q1 q2 NOTEST 0.0196794 0 -1.79769e+308 test_stat p_value q_value significant 86 -1.79769e+308 0.4767020 1 no 150 -1.79769e+308 0.3960920 1 no 186 -1.79769e+308 0.0631033 1 no 251 -1.79769e+308 0.4428030 1 no 358 -1.79769e+308 0.1083640 1 no 394 -1.79769e+308 0.1489190 1 no </code></pre> <p>So R didn't test the second condition... When using the & to test both conditions, I receive 0 rows:</p> <pre><code>dataOnBoth<-data[data$value_1 > 0 && data$value_2 > 0,] </code></pre> <p>How do I select all rows where value_1 > 0 and value_2 > 0?</p>

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