2025/4/30主要內(nèi)容從TXT文件中讀取數(shù)據(jù)把數(shù)據(jù)寫入TXT文件2025/4/30第一節(jié)從TXT文件中讀取數(shù)據(jù)MATLAB中讀取文本文件的常用函數(shù)2025/4/30一、利用數(shù)據(jù)導(dǎo)入向?qū)?dǎo)入TXT文件2025/4/30數(shù)據(jù)文件略去……【例6.1-1】利用數(shù)據(jù)導(dǎo)入向?qū)ёx取文件examp6_2_1.txt至examp6_2_11.txt中的數(shù)據(jù)2025/4/30二、調(diào)用高級(jí)函數(shù)讀取數(shù)據(jù)1.調(diào)用importdata函數(shù)讀取數(shù)據(jù)調(diào)用格式：importdata(filename)A=importdata(filename)A=importdata(filename,delimiter)A=importdata(filename,delimiter,headerline)[AD]=importdata(…)[ADH]=importdata(…)[…]=importdata(‘-pastespecial’,…)

2025/4/30>>importdata('examp6_2_4.txt')>>x=importdata('examp6_2_7.txt')>>x=importdata('examp6_2_3.txt',';')>>x=importdata('examp6_2_8.txt','',2)>>[x,s,h]=importdata('examp6_2_7.txt')>>FileContent=importdata('examp6_2_10.txt')【例6.1-2】調(diào)用importdata函數(shù)讀取文件examp6_2_1.txt至examp6_2_11.txt中的數(shù)據(jù)2025/4/302.調(diào)用load函數(shù)讀取數(shù)據(jù)調(diào)用格式：S=load(filename)S=load(filename,variables)S=load(filename,'-mat',variables)S=load(filename,'-ascii')load(...)load...2025/4/30>>loadexamp6_2_1.txt>>load-asciiexamp6_2_1.txt>>x1=load('examp6_2_2.txt')>>x1=load('examp6_2_2.txt','-ascii');>>loadexamp6_2_3.txt>>loadexamp6_2_4.txt……【例6.1-3】調(diào)用load函數(shù)讀取文件examp6_2_1.txt至examp6_2_12.txt中的數(shù)據(jù)2025/4/303.調(diào)用dlmread函數(shù)讀取數(shù)據(jù)調(diào)用格式：M=dlmread(filename)M=dlmread(filename,delimiter)M=dlmread(filename,delimiter,R,C)M=dlmread(filename,delimiter,range)2025/4/30>>x=dlmread('examp6_2_3.txt')>>x=dlmread('examp6_2_3.txt',',',2,3)>>x=dlmread('examp6_2_3.txt',',',[1,2,2,5])>>x=dlmread('examp6_2_5.txt')>>x=dlmread('examp6_2_6.txt')>>x=dlmread('examp6_2_9.txt')……【例6.1-4】調(diào)用dlmread函數(shù)讀取文件examp6_2_1.txt至examp6_2_11.txt中的數(shù)據(jù)2025/4/304.調(diào)用textread函數(shù)讀取數(shù)據(jù)調(diào)用格式：[A,B,C,…]=textread('filename','format')[A,B,C,…]=textread('filename','format',N)[…]=textread(…,'param','value',…)textread函數(shù)支持的format字符串textread函數(shù)支持的參數(shù)名與參數(shù)值列表2025/4/30>>x1=textread('examp6_2_1.txt');>>x2=textread('examp6_2_2.txt');>>x3=textread('examp6_2_3.txt','','delimiter',',');>>[c1,c2,c3,c4,c5]=textread('examp6_2_4.txt','%f%f%f%f%f','delimiter',',;*');>>x5=textread('examp6_2_5.txt','','emptyvalue',-1)>>x8=textread('examp6_2_8.txt','','headerlines',7)>>x9=textread('examp6_2_9.txt','','delimiter',',','whitespace','+i')>>[c1,c2,c3,c4,c5,c6,c7,c8]=textread('examp6_2_9.txt',...'%f%f%f%f%f%f%f%f','delimiter',',','whitespace','+i');……【例6.1-5】調(diào)用textread函數(shù)讀取文件examp6_2_1.txt至examp6_2_11.txt中的數(shù)據(jù)2025/4/30三、調(diào)用低級(jí)函數(shù)讀取數(shù)據(jù)1.調(diào)用fopen函數(shù)打開文件調(diào)用格式：[fid,message]=fopen(filename,permission)[filename,permission]=fopen(fid)2025/4/302.調(diào)用fclose函數(shù)關(guān)閉文件調(diào)用格式：status=fclose(fid)status=fclose('all')2025/4/303.調(diào)用fseek、ftell、frewind和feof函數(shù)控制讀寫位置調(diào)用格式：status=fseek(fid,offset,origin)position=ftell(fid)frewind(fid)eofstat=feof(fid)2025/4/304.調(diào)用fgets、fgetl函數(shù)讀取文件的下一行調(diào)用格式：tline=fgets(fid)tline=fgets(fid,nchar)tline=fgetl(fid)2025/4/305.調(diào)用textscan函數(shù)讀取數(shù)據(jù)調(diào)用格式：C=textscan(fid,'format')C=textscan(fid,'format',N)C=textscan(fid,'format',param,value,…)C=textscan(fid,'format',N,param,value,…)C=textscan(str,…)[C,position]=textscan(…)2025/4/30>>fid=fopen('examp6_2_8.txt','r');>>fgets(fid);>>fgets(fid);>>A=textscan(fid,'%f%f%f%f%f%f','CollectOutput',1)A=[3x6double]>>fgets(fid);>>fgets(fid);>>B=textscan(fid,'%f%f%f','CollectOutput',1)B=[2x3double]>>fclose(fid);……【例6.1-6】調(diào)用textscan函數(shù)讀取文件examp6_2_1.txt至examp6_2_13.txt中的數(shù)據(jù)2025/4/30第二節(jié)把數(shù)據(jù)寫入TXT文件MATLAB中寫文本文件的常用函數(shù)2025/4/30一、調(diào)用dlmwrite函數(shù)寫入數(shù)據(jù)調(diào)用格式：dlmwrite(filename,M)dlmwrite(filename,M,'D')dlmwrite(filename,M,'D',R,C)dlmwrite(filename,M,'attrib1',value1,'attrib2',value2,…)dlmwrite(filename,M,'-append')dlmwrite(filename,M,'-append',attribute-valuelist)dlmwrite函數(shù)支持的參數(shù)名與參數(shù)值列表2025/4/30>>x=[1.455390+1.360686i8.692922+5.797046i5.498602+1.449548i8.530311+6.220551i3.509524+5.132495i4.018080+0.759667i2.399162+1.233189i1.839078+2.399525i4.172671+0.496544i9.027161+9.447872i4.908641+4.892526i3.377194+9.000538i];>>dlmwrite('examp6_2_9.txt',x,'delimiter',',','newline','pc')【例6.2-1】用逗號(hào)作為分隔符，調(diào)用dlmwrite函數(shù)將如下復(fù)數(shù)矩陣寫入文件examp6_2_9.txt2025/4/30二、調(diào)用fprintf函數(shù)寫入數(shù)據(jù)調(diào)用格式：count=fprintf(fid,format,A,…)【例】

%在屏幕上顯示一句話>>y=fprintf(1,'祝福我們偉大的新中國(guó)%d周歲生日快樂?。?！',60)祝福我們偉大的新中國(guó)60周歲生日快樂?。?！y=382025/4/30>>x=10*rand(8,5);>>fid=fopen('examp6_2_01.txt','wt');>>fprintf(