Is it possible to merge entry parameters to create a dynamic field handle?

Question

I'm trying to merge a field name prefix with entry.section to make a dynamic field handle. I'm guessing I'm setting the sectionMatrix variable incorrectly, causing the code to fail without error. Any tips would be greatly appreciated.

Channels:

• News
• Press

Each channel has is own matrix field, with different blocks:

• entryMatrixNews
• entryMatrixPress

Template Code:

{% set newsSectionIds = craft.entries.section('news').ids() %}
{% set pressSectionIds = craft.entries.section('press').ids() %}
{% set entryIds = newsSectionIds|merge(pressSectionIds) %}
{% set entries = craft.entries.id(entryIds) %}

{% for entry in entries %}
   {% set sectionMatrix = 'entry.entryMatrix' ~ entry.section %}
   {# sectionMatrix then equals either entry.entryMatrixNews or entry.entryMatrixPress #}

   {% for block in sectionMatrix %}
      {# my matrix code #}
   {% endfor %}

{% endfor %}

Answer 1

The Twig attribute function solved this for me. Thanks to @tom-bauer

Revised Template Code:

{% set newsSectionIds = craft.entries.section('news').ids() %}
{% set pressSectionIds = craft.entries.section('press').ids() %}
{% set entryIds = newsSectionIds|merge(pressSectionIds) %}
{% set entries = craft.entries.id(entryIds) %}

{% for entry in entries %}

    {% set sectionMatrix = attribute(entry, "entryMatrix"~entry.section) %}

    {% for block in sectionMatrix %}

        {# my matrix code #}

    {% endfor %}

{% endfor %}