Sprout Reports plugin - How to output a Matrix field into a row
I got it to work with this code:

{% for entry in entries %}

    {% set myArray = [entry.title] %}

    {% for block in entry.myMatrixField %}

        {% set myArray = myArray|merge([block.field1,block.field2,block.field3]) %}  

    {% endfor %}

    {% do craft.sproutReports.addRow(myArray) %}

{% endfor %}