error in combine features code

Hi

i wrote i code to extract SURF and MSER featuers then compine featuers

i got error"Dimensions of arrays being concatenated are not consistent"

HOW CAN I FIXED THIS PROBLEM??AND WHATE THE NEXT CODE TO DETECT PEOPLE IN IMAGE??

[regon,d] = detectMSERFeatures(I1,'ThresholdDelta',2,'MaxAreaVariation',1);%
[features, valid_point3] = extractFeatures(I1,regon);
points=detectSURFFeatures(I1,'NumOctaves',1,'NumScaleLevels',3,'MetricThreshold',5000);
[features1, valid_point] = extractFeatures(I1,points);
comfeat=[features(:),features1(:)];

[Walter Roberson]

comfeat = [features(:); features1(:)];

[hajer jon]

Thank you so much