MATLAB: How to split long string into group and cut off the excessive string.

arraycell arraysMATLABstring

Let's say I have a string of length 1481. I want to split it into a group that contains 19 string in each group. However, there is an excessive string that is not enough to make it into a group and I want to cut it. How do I do that?
 aaSeq = 'MQKSPLEKAGVLSKLFFSWTRPILRKGYRQRLELSDIYQIPSADSADNLSEKLEREWDRELASKKKPKLINALRRCFFWRFMFYGILLYLGEVTKAVQPLLLGRIIASYDPDNKVERSIAIYLGIGLCLLFVVRTLLLHPAIFGLHHIGMQMRIAMFSLIYKKTLKLSSRVLDKISIGQLISLLSNNLNKFDEGLALAHFVWISPLQVTLLMGLLWELLQASAFCGLAFLIVLALVQAGLGRMMMKYRDQRAGKINERLVITSEMIENIQSVKAYCWEEAMEKMIENLRQTELKLTRKAAYVRYFNSSAFFFSGFFVVFLSVLPYALTKGIILRKIFTTISFCIVLRMAVTRQFPWAVQTWYDSLGAINKIQDFLQKQEYKTLEYNLTTTEVVMDNVTAFWEEGFGELFEKAKQNNSDRKISNGDNNLFFSNFSLLGAPVLKDISFKIERGQLLAVAGSTGAGKTSLLMMIMGELEPSEGKIKHSGRISFCSQFSWIMPGTIKENIIFGVSYDEYRYKSVIKACQLEEDISKFTEKDNTVLGEGGITLSGGQRARISLARAVYKDADLYLLDSPFGYLDVLTEKEIFESCVCKLMANKTRILVTSKMEHLKKADKILILHEGSSYFYGTFSELQSLRPDFSSKLMGYDSFDQFSAERRNSILTETLRRFSLEGDASISWNDTRKQSFKQNGELGEKRKNSILNPVNSMRKFSIVPKTPLQMNGIEEDSDASIERRLSLVPDSEQGEAILPRSNMINTGPMLQGCRRQSVLNLMTHSVSQGPSIYRRTTTSARKMSLAPQTNLTEMDIYSRRLSQESGLEISEEINEEDLKECFIDDVDSIPTVTTWNTYLRYITVHRSLIFVLIWCIVIFLAEVAASLVVLWLFGNTAPQDKENSTKSGNSSYAVIITNTSSYYFFYIYVGVADTLLALGLFRGLPLVHTLITVSKILHHKMLHSVLQAPMSTLNTLKAGGILNRFSKDIAILDDLLPLTIFDFIQLLLIVVGAIAVVSVLQPYIFLATVPVIAAFILLRAYFLHTSQQLKQLESEGRSPIFTHLVTSLKGLWTLRAFGRQPYFETLFHKALNLHTANWFLYLSTLRWFQMRIEMIFVLFFIAVAFISILTTGEGEGRVGIILTLAMNIMSTLQWAVNSSIDVDSLMRSVSRVFKFIDMPTEETKSTKSIKPSSNCQLSKVMIIENQHVKKDDVWPSGGQMTVKGLTAKYIDSGNAILENISFSISPGQRVGLLGRTGSGKSTLLSAFLRLLNTEGEIQIDGVSWDSITLQQWRKAFGVIPQKVFIFSGTFRKNLDPYEQWSDQEIWKVADEVGLRSVIEQFPGKLDFVLVDGGYVLSHGHKQLMCLARSVLSKAKILLLDEPSAHLDPITYQIIRRTLKQAFADCTVILCEHRIEAMLECQRFLVIEENTVRQYESIQKLLSEKSLFRQAISSSDRAKLFPHRNSSKHKSRPQITALKEEAEEEVQGTRL';
seqLength = strlength(aaSeq)
mat = reshape(aaSeq,19,[]).'

Best Answer

aaSeq = 'MQKSPLEKAGVLSKLFFSWTRPILRKGYRQRLELSDIYQIPSADSADNLSEKLEREWDRELASKKKPKLINALRRCFFWRFMFYGILLYLGEVTKAVQPLLLGRIIASYDPDNKVERSIAIYLGIGLCLLFVVRTLLLHPAIFGLHHIGMQMRIAMFSLIYKKTLKLSSRVLDKISIGQLISLLSNNLNKFDEGLALAHFVWISPLQVTLLMGLLWELLQASAFCGLAFLIVLALVQAGLGRMMMKYRDQRAGKINERLVITSEMIENIQSVKAYCWEEAMEKMIENLRQTELKLTRKAAYVRYFNSSAFFFSGFFVVFLSVLPYALTKGIILRKIFTTISFCIVLRMAVTRQFPWAVQTWYDSLGAINKIQDFLQKQEYKTLEYNLTTTEVVMDNVTAFWEEGFGELFEKAKQNNSDRKISNGDNNLFFSNFSLLGAPVLKDISFKIERGQLLAVAGSTGAGKTSLLMMIMGELEPSEGKIKHSGRISFCSQFSWIMPGTIKENIIFGVSYDEYRYKSVIKACQLEEDISKFTEKDNTVLGEGGITLSGGQRARISLARAVYKDADLYLLDSPFGYLDVLTEKEIFESCVCKLMANKTRILVTSKMEHLKKADKILILHEGSSYFYGTFSELQSLRPDFSSKLMGYDSFDQFSAERRNSILTETLRRFSLEGDASISWNDTRKQSFKQNGELGEKRKNSILNPVNSMRKFSIVPKTPLQMNGIEEDSDASIERRLSLVPDSEQGEAILPRSNMINTGPMLQGCRRQSVLNLMTHSVSQGPSIYRRTTTSARKMSLAPQTNLTEMDIYSRRLSQESGLEISEEINEEDLKECFIDDVDSIPTVTTWNTYLRYITVHRSLIFVLIWCIVIFLAEVAASLVVLWLFGNTAPQDKENSTKSGNSSYAVIITNTSSYYFFYIYVGVADTLLALGLFRGLPLVHTLITVSKILHHKMLHSVLQAPMSTLNTLKAGGILNRFSKDIAILDDLLPLTIFDFIQLLLIVVGAIAVVSVLQPYIFLATVPVIAAFILLRAYFLHTSQQLKQLESEGRSPIFTHLVTSLKGLWTLRAFGRQPYFETLFHKALNLHTANWFLYLSTLRWFQMRIEMIFVLFFIAVAFISILTTGEGEGRVGIILTLAMNIMSTLQWAVNSSIDVDSLMRSVSRVFKFIDMPTEETKSTKSIKPSSNCQLSKVMIIENQHVKKDDVWPSGGQMTVKGLTAKYIDSGNAILENISFSISPGQRVGLLGRTGSGKSTLLSAFLRLLNTEGEIQIDGVSWDSITLQQWRKAFGVIPQKVFIFSGTFRKNLDPYEQWSDQEIWKVADEVGLRSVIEQFPGKLDFVLVDGGYVLSHGHKQLMCLARSVLSKAKILLLDEPSAHLDPITYQIIRRTLKQAFADCTVILCEHRIEAMLECQRFLVIEENTVRQYESIQKLLSEKSLFRQAISSSDRAKLFPHRNSSKHKSRPQITALKEEAEEEVQGTRL';
seqLength = strlength(aaSeq) ;
nend = seqLength-mod(seqLength,19) ;
aaSeq = aaSeq(1:nend) ;
mat = reshape(aaSeq,19,[]).'
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