I would really recommend to read the gretl manual on matrices.<br>Best,<br>Artur<br><br>Am 27. März 2012 19:47 schrieb clarodina clarodina <span dir="ltr">&lt;<a href="mailto:clarodina@gmail.com">clarodina@gmail.com</a>&gt;</span>:<br>
<div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">How to do a yes no calculation on matrix?<br><br>Matrix m has 2 columns class A and class B and 200 rows exam scores 0 - 100   Each row is 1 student <br>
<br>Want to sum the the number of students in class A with scores between 40 and 60 <br>
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