Making matrix with letters

How do I make NxN matrix using letter? This matrix should also be viewed in image.

[Jan]

The question is not clear. What does "using letter" mean? Do you want a char matrix?

A = ['ab'; 'cd']

What does "viewed as image" mean?

Answer 1

[Voss]

N = 50;
A = char(65+floor(26*rand(N)))

A = 50×50 char array
    'TTCUQXGZXMDDTWBGCOVXSZQLFDPEGMOYCWLVJDBBNLVWNKBVOV'
    'XFMWXJWDIPRZFCTVWUNQCZNTCAPMEKDDAONDDJSGZAFMAXHYZT'
    'XDNMBNYKUTUPDZGUDVYUTZOCAMEEDWPLPSDWHLHXBEYZQMOCEE'
    'SQFTJDWXXTNKBRINWFRWOVIYVGRVBKODXFXZLXTAKRSFKRCMRR'
    'HRYLZSSVXXAXVWSLAXNQOVBZGXGDMKYSTNANJHMDUKORLSAZQV'
    'ZGUKRODPJVZICKOYTLEMKBATUKYOQTYEWMHCPHNQPNTHCHVNWL'
    'TXEFYREDGQZCHPLABDRJUEWSLOAQNPHMAOXFSGMKOPFSVDGAGL'
    'TUNVIGBNZXLBKYZJOHHVSMLZVZZRVAEWAEBHEWJRNZTIFWWHRV'
    'QBGXRTMMCVKIARTXWUDDHWAVRVVHLTYELKNVEGXZDZENBUYDXC'
    'LRKZJBZXBREABTYRUHZXUYEUCITTRURXYWYKEETNPJUPTSRFMF'
    'WPAKELAHZBEFBOUATIQAGUEPRQVYSWMMOQSJUQKBRKVKTRMSWV'
    'WAQMBUVQMQZKTKFBUFVHDXLXJZPGCQOUCEAMBZOOJFRAWWDAMF'
    'EOLSWMJSCUJEVIUTYTWYPIDFJEIYFPSDGIQSSGCPFBLMAQESTU'
    'MEPDNIJQUUJZHNJJXZURNAXTYLLWYLNPLAFAQUOMLYWDWSLMLK'
    'BICQFPHOKPGFBNGYFQJWFKUXIXFJJIFNSJSWMWREVNXGDENBDM'
    'LRJKFVRTMAPUBUGUGJGWQCIYHYLLMTTELKEEKGEALQTNFRPUAK'
    'LASVCAMFFFCRXKYUHVOKIVTPBKZUNIERGCMGFARJMZMKKUVTDZ'
    'UKKRJMYFTFPNBSBYWAIWMQVXDXSINSAYJPGXCODZAMIIXAEZQG'
    'VLOPDVEQGQBVCZRSIZNTVQTOCQFTDZIVSORNSVWSTKTBHCQZFW'
    'HDLZCOJGKWAWRAEZMPIWPXILGMQWNMHHPAYOMXWTAFESFPWXEZ'
    'BZOHNVDRKLTEBOPHNNPBDMFTZFJZLSJDNXKDKROVFYVHTSRTBY'
    'LFWOPXWJGOMXOKVXKMTJAXOANSNGUAUVVRUMLNWTRLVGXHVZYL'
    'ZETQRHDNDAEJSHQARMCQLDDBXWAOFZDXSRDCGZLWBMZYMBLLJQ'
    'LYJZYILQJMNVUTHNWQOAPWCWGFUBDPXKQVRRLNIBITQAGCMDGK'
    'PEKRWFKLHRNIPEXVVTLBWEYIVVXDUXGXHWGFUGHAVYBZKFVSUF'
    'OCIGLLMOVHYISUBVCPGSFQLIMTDWZBJGXWSIMYIEXTXVGGVMWS'
    'UCLWVDQMFYXGWPBECAQXLJMYKZYOPCMJUPFUSCADIQWDIKJAPD'
    'PDBOYDTYQWHSFVNEJHVYIQEOLWUMFAXOVFKGCWHVJGSZOSHVDA'
    'PEXYTPGZNZPYJHTMBEDJDIYRDHDICFXSZNSFJTHMGNWOFZXBDP'
    'AQHCOMCBFQFNNKLSMWQICXNXPLGCJXFVRYIRDJMYHVJAJHAWXZ'
    'ADPKAKXYCKMCIGCESTMGAZGBZIZPIZKCLJIPRDPOPPPJJZTOUU'
    'SQSASTQQAOCDGXXDNGENGOMRWQCUWVVLWDGBQHANXXWCUDHVHX'
    'NKPYTRTNSWTSNFVGSHFUEORCQVSMAXWCVXWOCKZDVZOQPITCVE'
    'YIRFCGBUIXVJUTZPZRWCUZZMPASNESOTGMYYBFUVOAQZTHVAPM'
    'DCPZBCUNSRNUZFSDPYMAONXINQBITJVQTKMILIYYJMRFGIOZGX'
    'QCDSSIHAENCZFWQHJAJBEAETTHIFDZYCFBDCJLTXMTMCIBLLCF'
    'DQONDQBISKIRZNNBPXGXDTYLYOWGABFLRCMYFEPDFUGECFSBJR'
    'PHXMOLLYQCTHHWOKJISDNLTKEQMIRXTMGIVFIOXDRXSXYDZOII'
    'DOSQXNYAUEXAFNODFZVIBMCKYZEXWWUMDTRQDAYHDJUYRYOPBS'
    'XVUEIPQEPRPETYISVRMEIPJOBAUPPTSEYNZMCPVXALTSQRTGLZ'
    'KMBMYXYJIJJNXMMXCVRJKEHXIVCPVOQBLYGPQVBVRESLWNPELB'
    'XQADIZVCUABBYGFKQLIQYQQDJASNMCIKEPONLPKSVNIJBLXHJM'
    'RWAXKDUBCEECXMCGYJJTECJZFDXCPQSRVGDTHGIFQPFOPEPCVM'
    'ZVBOTABWKYNMRPSQVGFIIEXUOBACEESLPIEZFMLDZBOTDYKQWX'
    'SYAIAJFQQCJWKJBLWEUDAZIYCHKNJSSMCZEKWTHLSCHFLLMMTB'
    'HNPUKZWNZQGAOQVJKWARDYNDYSTUIMCDXNNNUCRIUXPFTOKDYA'
    'ENFIQIELWBXJQSPSJHORWMLTFSHTQDIJAZFBNINERBGEQHMVZO'
    'UWFWXSZAYNSEZGDXHHBBAUOLMIWINTKEBZLWWXWDKXRSURSDER'
    'URLIEJEPUMZWNXOVTARKZKZFKJEUUDGCJZSKCIUUWCSZRWREIY'
    'DISNAYHZASLQKRYPPFYYUVHEZGWTGIABQOUCZDKDBXZFNWLOWA'

figure();
[X,Y] = meshgrid(1:N,1:N);
text(X(:),Y(:),num2cell(A),'FontSize',6);
set(gca(),'XLim',[0 N+1],'YLim',[0 N+1],'YDir','reverse','Visible','off');