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
- 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
- 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
- 读取一个区域
m = csvread('csvlist.dat', 2, 0, [2,0,3,3])
m =
5 10 15 20
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]);
