diff --git a/demos/octave/CellularAutomata/saveCA.m b/demos/octave/CellularAutomata/saveCA.m
new file mode 100644
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+%
+% Utility function to save raw CA data to a text file format.
+% Unfortunately MAtlab's -ascii format only writes full doubles, making much larger files than we need.
+% So I wrote this.
+
+function saveCA(filename, caStates)
+
+	warning('off','MATLAB:Java:DuplicateClass');
+	javaaddpath('../../../infodynamics.jar');
+	addpath('..');
+
+	arrayWriter = javaObject('infodynamics.utils.ArrayFileWriter');
+	arrayWriter.makeIntMatrixFile(octaveToJavaIntMatrix(caStates), filename);
+	
+end
+