griddata_请教griddata和 linspace的用法 A=[数据省略];[X，Y，Z...[语文]

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这是写这段代码的人根据自己实际情况写的两个数字,你可以这样取

[X,Y,Z]=griddata(x,y,z,linspace(min(x),(max(x),m)',linspace(min(y),(max(y),n),'v4')

m,n代表分割数目,如果数据量太大,分隔数目就要取得大一点,否则很卡

其他类似问题

问题1：matlab中的插值函数 griddata的具体原理是什么呢?

griddata 调用方法：

ZI = griddata(x,y,z,XI,YI)

[XI,YI,ZI] = griddata(x,y,z,XI,YI)

[...] = griddata(...,method)

[...] = griddata(...,method,options)

method 的值 为

'linear' -- 则,以三角形为基础的线性内插

'cubic' -- 则,以三角形为基础的三次方程内插

'nearest' -- 则,用最邻近的点 内插

'v4'-- -- 则,MATLAB 4 格点样条函数内插

默认'linear' 线性内插

三角形为基础,就是按Delaunay方法先找出内插点四周的3个点,构成三角形,内插点在三角形内.然后线性内插,或三次方程内插.

'cubic' 和 'v4' 插值结果构成的曲面较光滑,'linear'和 'nearest' 插值结果构成的曲面不光滑不连续.

前3种方法具体算法见

[1] Barber,C.B.,D.P.Dobkin,and H.T.Huhdanpaa,"The Quickhull Algorithm for Convex Hulls," ACM Transactions on Mathematical Software,Vol.22,No.4,Dec.1996,p.469-483.Available in PDF format at http://www.acm.org/pubs/citations/journals/toms/1996-22-4/p469-barber/.

第4种方法具体算法见

[2] Sandwell,David T.,"Biharmonic Spline Interpolation of GEOS-3 and SEASAT Altimeter Data",Geophysical Research Letters,14,2,139-142,1987.

(参考了 MathWorks 主站材料）

问题2：如何用matlab中griddata函数来画出三维图像?这是高程点19个高程点30.442031.225030.134031.110030.059030.709031.206026.424029.487025.790031.338031.128030.989030.160030.741031.074030.621031.183030.3320如何画成如下的图啊

我没学过

问题3：[X,Y,Z]=griddata(x,y,z,linspace(min(x),max(x),200)',linspace(min(y),max(y),200),'v4');%是什么插值法[X,Y,Z]=griddata(x,y,z,linspace(min(x),max(x),200)',linspace(min(y),max(y),200),'v4');%是什么插值方法?‘v4’：MATLAB 4中的griddata算[数学科目]

拟合!

问题4：问余所以至此者 “以”的意义和用法是什么?[语文科目]

凭,凭借的意思.表示动作行为的凭借或前提.犹言凭、根据

何以谓之文.——《论语》

问题5：matlab中griddata函数怎么用不要把help中直接粘上,最好举个例子

知道一系列点的坐标如下（1.486,3.059,0.1）;（2.121,4.041,0.1）;（2.570,3.959,0.1）;（3.439,4.396,0.1）;（4.505,3.012,0.1）;（3.402,1.604,0.1）;（2.570,2.065,0.1）;（2.150,1.970,0.1）;（1.794,3.059,0.2）;（2.121,3.615,0.2）;（2.570,3.473,0.2）;（3.421,4.160,0.2）;（4.271,3.036,0.2）;（3.411,1.876,0.2）;（2.561,2.562,0.2）;（2.179,2.420,0.2）;（2.757,3.024,0.3）;（3.439,3.970,0.3）;（4.084,3.036,0.3）;（3.402,2.077,0.3）;（2.879,3.036,0.4）;（3.421,3.793,0.4）;（3.953,3.036,0.4）;（3.402,2.219,0.4）;（3.000,3.047,0.5）;（3.430,3.639,0.5）;（3.822,3.012,0.5）;（3.411,2.385,0.5）;（3.103,3.012,0.6）;（3.430,3.462,0.6）;（3.710,3.036,0.6）;（3.402,2.562,0.6）;（3.224,3.047,0.7）;（3.411,3.260,0.7）;（3.542,3.024,0.7）;（3.393,2.763,0.7）怎样用MATLAB绘制成三维曲面呢?

使用griddata插值

A=[1.486,3.059,0.1;2.121,4.041,0.1;2.570,3.959,0.1;3.439,4.396,0.1;

4.505,3.012,0.1;3.402,1.604,0.1;2.570,2.065,0.1;2.150,1.970,0.1;

1.794,3.059,0.2;2.121,3.615,0.2;2.570,3.473,0.2;3.421,4.160,0.2;

4.271,3.036,0.2;3.411,1.876,0.2;2.561,2.562,0.2;2.179,2.420,0.2;

2.757,3.024,0.3;3.439,3.970,0.3;4.084,3.036,0.3;3.402,2.077,0.3;

2.879,3.036,0.4;3.421,3.793,0.4;3.953,3.036,0.4;3.402,2.219,0.4;

3.000,3.047,0.5;3.430,3.639,0.5;3.822,3.012,0.5;3.411,2.385,0.5;

3.103,3.012,0.6;3.430,3.462,0.6;3.710,3.036,0.6;3.402,2.562,0.6;

3.224,3.047,0.7;3.411,3.260,0.7;3.542,3.024,0.7;3.393,2.763,0.7];

x=A(:,1);y=A(:,2);z=A(:,3);

scatter(x,y,5,z)%散点图

figure

[X,Y,Z]=griddata(x,y,z,linspace(1.486,4.271)',linspace(1.604,4.276),'v4');%插值

pcolor(X,Y,Z);shading interp%伪彩色图

figure,contourf(X,Y,Z) %等高线图

figure,surf(X,Y,Z)%三维曲面