例6-31  矩陣的指數和對數運算。
解：在命令窗口中輸入如下命令，并按Enter鍵確認。
>> X=rand(5)
X =
    0.7382    0.4103    0.0099    0.2722    0.9318
    0.1763    0.8936    0.1389    0.1988    0.4660
    0.4057    0.0579    0.2028    0.0153    0.4186
    0.9355    0.3529    0.1987    0.7468    0.8462
    0.9169    0.8132    0.6038    0.4451    0.5252
>>  Y=expm(X)
Y =
    4.0580    2.4922    0.8911    1.4878    3.2061
    1.6002    3.4700    0.7410    0.9972    1.9618
    1.4204    0.9001    1.5872    0.4963    1.4038
    4.0088    2.8747    1.2824    3.3876    3.8634
    3.6172    3.2420    1.5795    1.8430    4.3156
>> A=randn(5)
A =
    1.1909   -0.1867    0.1139    0.2944    0.8580
    1.1892    0.7258    1.0668   -1.3362    1.2540
   -0.0376   -0.5883    0.0593    0.7143   -1.5937
    0.3273    2.1832   -0.0956    1.6236   -1.4410
    0.1746   -0.1364   -0.8323   -0.6918    0.5711
>>  B=logm(A)
B =
   0.3888 + 0.1788i  -0.3025 - 0.1434i  -0.1178 - 0.7806i   0.0726 - 0.1536i   0.3109 - 1.0047i
   0.7058 + 0.0591i   0.7518 - 0.0474i   0.8678 - 0.2578i  -0.7877 - 0.0507i   0.5202 - 0.3319i
   0.1488 - 0.2631i  -0.6511 + 0.2110i  -0.0357 + 1.1486i   0.2579 + 0.2260i  -0.3681 + 1.4784i
  -0.3618 - 0.2551i   1.1678 + 0.2046i  -0.2730 + 1.1136i   0.9704 + 0.2192i  -0.7170 + 1.4334i
  -0.0652 - 0.2923i   0.1448 + 0.2344i  -0.1916 + 1.2760i  -0.2463 + 0.2511i   0.2271 + 1.6425i
>>