1、Matlab畫圖，以時間為橫坐標(biāo)的畫法?？梢韵葘r間轉(zhuǎn)化為小數(shù)，再顯示成時間?？紤]使用Matlab分兩步實現(xiàn)：1)將時間轉(zhuǎn)換為小數(shù)作圖；2)將小數(shù)重新映射為時刻充當(dāng)橫坐標(biāo)。主要需用到datenum和datetick兩個函數(shù)。x=datenum(Y,M,D,H,MN,S)datenum可以提取時間數(shù)據(jù)，也即上文提到的第一步。括號中的參數(shù)依次為year,month,day,hour,minute,second本例中時間僅含小時和分鐘，故將其他參數(shù)設(shè)為0。Dateaxis(tickaxis,dateform)Dateaxis將坐標(biāo)采用時間標(biāo)刻，也即第二步。tickaxis默認(rèn)為'x'

2、,dateform為時刻格式，可為字符串或?qū)?yīng)的數(shù)字。詳見MATLAB幫助文檔(或見圖Dateform)。DateFormFormatDescription0Ol-Mar-199915:45:17day-month-yearhour:minute:second101-mar-1999day-month-year2D3/U1/99month/day/year3Marmonth,threeletters4Mmonth,singleletter53month603/01month/day1dayofmonth8Weddayofweek,threeletters9Wdayofweek,singlele

3、tter101999year,fourdigits1199year,twodigits12monthyear1315:45:17hour:minute:second1403:45:17PMhour:minute:secondAMorPM1515:45hour:minute1603:45PMhour:minuteAMorPM1795/03/01yearmonthday代碼如下：%以時間為橫坐標(biāo)作圖Temp=load('D:temperature.txt');Time=importdata('D:time.txt');%文本格式為時分，如13:00Hour=Time

4、(:,1);Minute=Time(:,2);interval=datenum(0,0,0,Hour,Minute,0);plot(interval,Temp,'-bd','LineWidth',2,'MarkerFaceColor','r');axis(010160);%設(shè)置坐標(biāo)區(qū)間title('temp.VStime');xlabel('time');ylabel('temp/°C');x=interval;datetick('x','HH:MM

5、');%需用x作為數(shù)組變量圖例為某澆注過程的溫度控制曲線。t=linspace(datenum('6-26'),datenum('7-25'),6);plot(t,rand(size(t);datetick('x','mmm.dd','keepticks')StandardMATLABDateFormatDefinitionsdateform(number)dateform(string)Example0'dd-mmm-yyyyHH:MM:SS'01-Mar-200015:45:171，dd

6、-mmm-yyyy'01-Mar-20002'mm/dd/yy'03/01/003mmmMar4mM5mm03dateform(number)dateform(string)Example6'mm/dd'03/017'dd'018'ddd'Wed9'd'W10yyyy200011yy0012mmmyyMar0013'HH:MM:SS'15:45:1714'HH:MM:SSPM'3:45:17PM15'HH:MM'15:4516'HH:MMPM'

7、3:45PM17'QQ-YY'Q1-0118'QQ'Q119'dd/mm'01/0320'dd/mm/yy'01/03/0021'mmm.dd,yyyyHH:MM:SS'Mar.01,200015:45:1722'mmm.dd,yyyy'Mar.01,200023'mm/dd/yyyy'03/01/200024'dd/mm/yyyy'01/03/200025'yy/mm/dd'00/03/0126'yyyy/mm/dd'2000/03/0127'QQ-YYYY'Q1-200128mmmyyyyMar200029(ISO8601)'yyyy-mm-dd