def linearMatrix(self, writer, provider1, provider2, index1, index2, nearest, distArea, matType, sindex, progressBar):
        if nearest > 1:
            inFeat = QgsFeature()
            outFeat = QgsFeature()
            inGeom = QgsGeometry()
            outGeom = QgsGeometry()
            start = 15.00
            add = 85.00 / provider1.featureCount()
            while provider1.nextFeature(inFeat):
                inGeom = inFeat.geometry()
                inID = inFeat.attributeMap()[index1].toString()
                featList = sindex.nearestNeighbor(inGeom.asPoint(), nearest)
                distList = []
                vari = 0.00
                for i in featList:
                    provider2.featureAtId(int(i), outFeat, True, [index2])
                    outID = outFeat.attributeMap()[index2].toString()
                    outGeom = outFeat.geometry()
                    dist = distArea.measureLine(inGeom.asPoint(), outGeom.asPoint())
                    if dist > 0:
                        if matType == "Linear": writer.writerow([unicode(inID), unicode(outID), str(dist)])
                        else: distList.append(float(dist))
                if matType == "Summary":
                    mean = sum(distList) / len(distList)
                    for i in distList:
                        vari = vari + ((i - mean)*(i - mean))
                    vari = sqrt(vari / len(distList))
                    writer.writerow([unicode(inID), str(mean), str(vari), str(min(distList)), str(max(distList))])
                start = start + add
                progressBar.setValue(start)
            del writer
        else:
            # print our message to user?
            break