MATLAB: Error using num2str

gscatter3 pca plot

Hello, I try to use gscatters to draw the pca plot.
    >> a=randn(10)
    a =
    0.1380    1.1569   -0.1609    0.3105    0.5558    0.4394   -0.8964   -1.0145    0.8531   -0.4698
   -0.7107    0.0530    0.4093   -0.2495   -1.1203   -0.0896   -1.2033   -0.2133    0.4043    0.8864
    0.7770   -1.2884   -0.9526    0.5037   -1.5327    1.0212    1.0378   -0.3253   -0.7006   -1.3852
    0.6224   -0.3712    0.3173   -0.8927   -1.0979   -0.8740   -0.8459    1.9444   -1.6305   -1.9568
    0.6474   -0.7578    0.0780    1.9085   -1.4158    0.4147   -0.1729   -0.5718    1.4600    0.4207
   -0.4256   -0.5640    1.3244    0.1222    0.0596    0.3484   -1.2087   -0.2500    2.0500    0.4007
    1.0486    0.5551   -0.2132    1.0470   -0.4113    0.3493   -0.2971   -1.5693    0.1205    0.0951
    0.6607   -0.5568   -0.1345   -0.2269   -0.3680   -0.7292   -3.2320   -0.4774   -0.9899    0.4967
    2.5088   -0.8951   -1.1714   -0.1625   -1.3610    0.3268   -1.0870   -1.3380    1.1978    1.0822
    1.0635   -0.4093   -1.3853    0.6901    0.7796   -0.5149   -1.4264    0.0303   -0.5927    0.9704
    >> [~, scores,pcvars]=pca(a)
    scores =
    0.7231   -0.4236   -0.8435    1.6875   -0.6992    0.2655   -0.0274   -0.0061   -0.3268
    0.1185   -0.8979   -1.0235   -0.6050   -0.0047   -0.8379   -0.6529    0.6096   -0.0189
   -0.9948    2.9174    0.1385    0.0806    0.1037   -0.2427   -0.5801   -0.5163   -0.0227
   -3.8238    0.2561   -0.6242   -0.3132   -0.2561    0.4312    0.4093    0.3275    0.0336
    1.5496    1.1953   -0.4926   -0.6628    0.9139   -0.1605    0.7067    0.1346   -0.2196
    1.2263   -0.9438   -2.0018   -0.6615    0.0639    0.6865   -0.1349   -0.4513    0.2163
    0.9502    0.5985    0.2710    1.1530   -0.2914   -0.5412    0.4474    0.1301    0.3926
   -0.9756   -2.1818    1.0927   -0.3772   -0.0722   -0.6675    0.2564   -0.6411   -0.0881
    1.4738    0.4494    1.9580   -1.1421   -0.9287    0.4928   -0.0722    0.2144   -0.0180
   -0.2473   -0.9696    1.5253    0.8409    1.1708    0.5739   -0.3524    0.1987    0.0517
    pcvars =
    2.6823
    2.0158
    1.5384
    0.8532
    0.4142
    0.3139
    0.2049
    0.1645
    0.0410
    >> x=zscore(scores(:,1));
    >> y=zscore(scores(:,2));
    >> z=zscore(scores(:,3));
    >> gscatter3(x,y,z,tmp1,{'b','g','m'},{'.','.','.'},15)
    Error using num2str (line 45)
    Input to num2str must be numeric.
    Error in gscatter3 (line 103)
        g=cellstr(num2str(g'))';

Best Answer

For that version of gscatter3:
gscatter3(x,y,z,cellstr(tmp1),{'b','g','m'},{'.','.','.'},15)
You cannot pass that routine a cell array of string variables, but you can pass it a cell row vector of character vectors.
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