矩阵相关

data=readtable('成绩2.txt','delimiter','\t','ReadVariableNames',0);

data1=table2array(data);

y=data1(data1(:,3)==1,:);%筛选

data(:,4)=[];%删除列

data1(:,6:7)=0;%元素改动

MATLAB的拟合

data=readtable('旅客数量.txt','delimiter','\t');

data.Properties.VariableNames={'t','y'};

data.t=[1:48]';t=data.t;y=data.y;y=log(y);

myfun=fitlm(t,y,'linear','VarNames',{'t','y'});

b=myfun.Coefficients.Estimate;

yhat=b(1)+b(2)*t;

plot(t,y,'+',t,yhat,'r');

ax=gca;

ax.YLabel.String='logy';

ax.XLabel.String='t';

t分布

ezplot('pdf(''t'',t,24)',[-3:3]);

ax=gca;

td=[-2:0.01:1];

yd=pdf('t',td,24);

td=[-2 td 1];

yd=[0 yd 0];

p=patch('Parent',ax,'YData',yd,'XData',td,'FaceColor',[0 0 1]);

ax.YLim=[0 0.4];

柱形图啊

t=readtable('设备价值.txt','delimiter','\t');

type=t.name;

bar(t.value);

hold on;

P=[1:5];

Q=t.value;

scatter(P,Q);

plot(P,Q);

hold off;

ax=gca;

ax.YTickLabel=[0:10000:140000];

ax.YTick=[0:10000:280000];

ax.XTickLabel=type;

ax.YLabel.String='金额';

ax.XLabel.String='项目';

title(ax, '设备金额');

加权平均

X=[10000:20000:110000];

Y=[3 11 36 26 14 10];

Xbar=X*Y'/sum(Y);

Xstd=sqrt((X-Xbar).^2*Y'/sum(Y));

分类啊

data=readtable('³É¼¨.txt','delimiter','\t');

ans1=grpstats(data,{'class'},{'mean','std','max','min'},'DataVars','delphi');

ans2=grpstats(data,{'gender'},{'mean','std','max','min'},'DataVars','english');

分组

data=readtable(’成绩','delimiter','\t');

N=histcounts(data.math,[50:100]);

histogram(data.math);

ezplot('tpdf(x,24)',[-3

3])

ax=gca

ax.YLim=[0

0.4]

x=[-2:0.01:1]

y=[0,tpdf(x,24),0]

x=[-2

x 1]

patch('Parent',ax,'YData',y,'XData',x,'FaceColor',[0

0 1])

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