In the example in matlab function fopen to open the file specified as follows:
* 1) "fopen" to open the file, give the file code.
语法1：FID= FOPEN（filename,permission）
Open the file in the specified manner
FID = + N (N is a positive integer): indicates the file is opened successfully, the file code is N.
FID = -1: indicates the file open unsuccessful.
FID before the file is closed always effective.
If you open for reading, matlab first searches the working directory, followed by a search of other directories matlab, "permission" is to open the way parameters.
Open string determined by the following parameters:
r read
w write (if the file exists, created automatically)
a subsequent write (if the file exists, automatically created)
r + reading and writing (file should already exist)
w + refresh writing (if the file exists, created automatically)
a + a subsequent write (if the file exists, automatically created))
w rewritten, but does not automatically refresh
a subsequent write, but does not automatically refreshed
File storage format: the default mode is to open the file: Binary. Open text, may be added to "t" file, such as "rt" in the mode parameter "permission" in, "wt +"
Specific use in matlab fprintf function examples are as follows:
fprintf function data can be written to a text file in the format specified. Its call format is:
Formatted output data: fprintf (fid, format, variables)
According to the specified format value of the variable output to the screen or the specified file
fid is a file handle, if the default, then output to the screen
1 for standard output (the screen) or 2 for standard error. If FID is omitted, output goes to the screen.
format format in which the data used to specify the output
% d Integer
% e real number: SCIENCE calculation form
%f 实数：小数形式
%g 由系统自动选取上述两种格式之一
%s 输出字符串
fprintf（fid，format，A）
说明：fid为文件句柄，指定要写入数据的文件，format是用来控制所写数据格式的格式符，与fscanf函数相同，A是用来存放数据的矩阵。
例6.9 创建一个字符矩阵并存入磁盘，再读出赋值给另一个矩阵。
>> a='string';
>> fid=fopen('d:\char1.txt','w');
>> fprintf(fid,'%s',a);
>> fclose(fid);
>> fid1=fopen('d:\char1.txt','rt');
>> b=fscanf(fid1,'%s')
b =
string
matlab读txt文件
fid=fopen('fx.txt','r');
%得到文件号
[f,count]=fscanf(fid,'%f %f',[12,90]);
%把文件号1的数据读到f中。其中f是[12 90]的矩阵
%这里'%f %f'表示读取数据的形势，他是按原始数据型读出
fclose(fid);
%关闭文件
另外有的txt文件还可以用load来打开
其语句为
f=load('fx.txt)
转载于:https://www.cnblogs.com/AI-Algorithms/p/3670867.html