MATLAB繪制平滑曲線

1、MATLAB繪制平滑曲線x=0.10.160.270.410.480.590.8;y=870118100905;以上是每一個(gè)X和Y對(duì)應(yīng)的坐標(biāo)，請(qǐng)問(wèn)如何編程能夠繪制平滑曲線，這個(gè)圖形就像二次函數(shù)一樣的如果要在圖中繪制一條直線加上y=70的直線，用不同顏色區(qū)分！x=00.10.160.270.410.480.590.8;y=59701181001705;y1=22.822.822.822.822.822.822.822.8;values1=spcrv(x(1)xx(end);y(1)yy(end),3,1000);values2=spcrv(x(1)xx(end);y1(1)y1y1(end),3

2、,1000);plot(values1(1,:),values1(2,:),r,values2(1,:),values2(2,:),b)ans2:代碼如下：x=0.10.160.270.410.480.590.8;y=870118100905;xp=0:0.1:1;yp=interp1(x,y,xp);plot(x,y,b-,xp,yp,r-)%紅色為差值后的平滑圖像holdony1=70;plot(xp,y1,c-)%自己試一下ans3:x=0.10.160.270.410.480.590.8;y=870118100905;X=linspace(0,.9);Y=spline(x,y,X);a

3、notherfile:helpsmooth自己查一下幫助anotherquestion:x有90個(gè)值，Y也有90個(gè)值，一一對(duì)應(yīng)，用PLOT(x,y)后是折線，請(qǐng)問(wèn)怎樣把它改為平滑曲線，謝謝!ans:平滑曲線的話,建議你用樣條插值。比方說(shuō)，已知的數(shù)據(jù)是X,Y你將X的間隔變小一些賦于xiX=1:90;Y=(-X+45).*(X=45);xi=1:0.5:90;%這個(gè)點(diǎn)比X的多yi=interp1(X,Y,xi,spline);plot(X,Y,*,X,Y,b,xi,yi,r)你注意看上面這圖(你放大看)里面的X=45時(shí)，藍(lán)線是折線，而紅線應(yīng)當(dāng)有一點(diǎn)弧度2040600D100anotherquest

4、ion:【求助】用matlab作物理實(shí)驗(yàn)圖，怎樣使曲線平滑一些,讓點(diǎn)大致在一條曲線對(duì)很好用的我給你個(gè)例子吧x=4042434548555860626567697072747585909597;uh=7.099.849.759.689.629.529.509.479.449.419.399.379.369.349.329.319.28.043.382.41;y=uh/40.24;yi0=interp1(x,y,0.025,linear);xi=40:0.5:100;yi=interp1(x,y,xi,linear);zi=interp1(x,y,xi,spline);wi=interp1(x,y

5、,xi,cubic);plot(x,y,o,xi,yi,r+,xi,zi,g*,xi,wi,k.-);legend(原始點(diǎn),線性點(diǎn),三次樣條,三次多項(xiàng)式)分解為四張圖如下所示：matlab分布曲線平滑問(wèn)題2008-11-3023:48x=00.0540.070.0740.090.1050.1250.1540.20.28;y=07.153.87582.1785.688990.12590.2297.56597.66;試過(guò)多項(xiàng)式擬合和樣條平滑，效果就是不好，了解的大蝦們幫下忙啦。(是分布曲線哦)滿意回答%樣條擬合效果不好，用內(nèi)插x=00.0540.070.0740.090.1050.1250.1540.20.28;y=07.153.87582.1785.688990.12590.2