matlab绘图函数

reshape(a,1,9) 与 repmat (a,1,2) 的比较

使用Matlab如何画出上面的箱线图群组？

示例：

data = rand(20,24)

month = repmat({\'jan\' \'feb\' \'mar\' \'apr\' \'may\' \'jun\' \'jul\' \'aug\' \'sep\' \'oct\' \'nov\' \'dec\'},1,2);

simobs = [repmat({\'sim\'},1,12),repmat({\'obs\'},1,12)];

boxplot(data,{month,simobs},\'colors\',repmat(\'rb\',1,12),\'factorgap\',[5 2],\'labelverbosity\',\'minor\');

另一种方法是利用不同坐标使用hold on在同一幅图上画箱线图

% Boxplot for the observed temperature from January to December

Temp_O = [Jan_O, Feb_O, Mar_O, Apr_O, May_O, Jun_O, Jul_O, Aug_O, Sep_O, Oct_O, Nov_O, Dec_O]; % Jan_O 为列向量

position_O = 1:1:12;

% Define position for 12 Month_O boxplots

box_O = boxplot(Temp_O,\'colors\',\'b\',\'positions\',position_O,\'width\',0.18);

set(gca,\'XTickLabel\',{\' \'}) % Erase xlabels

hold on % Keep the Month_O boxplots on figure overlap the Month_S boxplots

% Boxplot for the simulated temperature from January to December

Temp_S = [Jan_S, Feb_S, Mar_S, Apr_S, May_S, Jun_S, Jul_S, Aug_S, Sep_S, Oct_S, Nov_S, Dec_S];

position_S = 1.3:1:12.3; % Define position for 12 Month_S boxplots

box_S = boxplot(Temp_S,\'colors\',\'r\',\'positions\',position_S,\'width\',0.18);

hold off % Insert texts and labels

以上两种方法均可画多组的箱线图

上下四分位数（Q3和Q1），四分位距IQR=Q3-Q1。异常值被定义为小于Q1－1.5IQR或大于Q3+1.5IQR的值。