我们经常会遇到如图中的多个相似名称的多个文件，如何将这多个文件中的数据提取到同一个文件中，方便数据分析呢？

• matlab代码如下：

for i=0:20;                      %定义需要提取的文件数目
filename=strcat('no_1m.',num2str(i),'.csv');    %用i把文件名称相连
fid=csvread(filename,1,9,[1,9,1,9]);     %定位需要提取的数据在文件中的坐标
M=fid/1000000;                        %对提取的数据进行操作
dlmwrite('without spray Uy.csv',M,'-append','precision',10); % 对提取的数据写入一个新的文件中
end

• 关于matlab中的csvread命令：
  下面是一个csv文件中的内容,名称为csvlist：

   02, 04, 06, 08, 10, 12
   03, 06, 09, 12, 15, 18
   05, 10, 15, 20, 25, 30
   07, 14, 21, 28, 35, 42
   11, 22, 33, 44, 55, 66

1. 读取整个数据集m=csvread('csvlist.dat')

m =
     2     4     6     8    10    12
     3     6     9    12    15    18
     5    10    15    20    25    30
     7    14    21    28    35    42
    11    22    33    44    55    66

1. 从第3行，第1列开始读m = csvread('csvlist.dat', 2, 0)

m =
     5    10    15    20    25    30
     7    14    21    28    35    42
    11    22    33    44    55    66

1. 读取一个区域m = csvread('csvlist.dat', 2, 0, [2,0,3,3])

m =
     5    10    15    20

1. 百度经验

MATLAB画函数图

%论文14拖曳系数图，图1，图2 
ezplot('y1-0.16./[log(5302.7./x.^2)].^2=0',[0 4 10^-3 5*10^-3]);
hold on
ezplot('y2-((1-5.167*10^-2*x^2)*0.16./[log(5302.7./x.^2)].^2)=0',[0 4 10^-3 5*10^-3]);
grid on+

MATLAB设置图片大小

clear;
hold on;
x1=[27.3,33.1,40.8,50.8];
y1=[0.00193,0.00197,0.00193,0.00148];
scatter(x1,y1,'k');
hold on;
x2=[27.3,33.0,40.9,50.8];
y2=[0.00196,0.00215,0.00186,0.00150];
scatter(x2,y2,'+');
hold on;
x3=[27.9,32.7,39.7,49.8];
y3=[0.00146,0.00223,0.00260,0.00189];
scatter(x3,y3,'x');
hold on;
x4=[27.6,32.5,40.3,50.1];
y4=[0.00178,0.00244,0.00216,0.00173];
scatter(x4,y4,'d');

scatter(x1,y1,'k');
hold on;
scatter(x2,y2,'+');
hold on;
scatter(x3,y3,'x');
hold on;
scatter(x4,y4,'d');

set (gcf,'Position',[100,100,320,256]);%设置输出图片大小
set (gcf,'Position',[100,100,500,400]);