Matlab代码备忘

1.Matlab读取和写入文件

 %读取数据

 name=strcat('ptsinterval90_00000',num2str(),'.txt');

 fid=fopen(name,'r');

 sizeA=[ Inf];

 A =fscanf(fid,'%f %f %f %f',sizeA);

 fclose(fid);

写入文件

    set(hp1,'xdata',bbb(1,:),'ydata',bbb(2,:),'zdata',bbb(3,:));

    M=size(bbb,2);

    name=strcat('laser_',num2str(i),'.txt');

    fid=fopen(name,'a+');

    for kk =1:M

        fprintf(fid,'%g %g %g\r\n',bbb(1,kk),bbb(2,kk),bbb(3,kk));

    end

    fclose(fid);

保存矩阵

 function [ flag ] = SaveMatrix( filename, mat,type )

 %SAVEMATRIX 此处显示有关此函数的摘要

 %   此处显示详细说明

 % type  数字

 % type  字符

 fid=fopen(filename,'wt');%写入文件路径

 [m,n]=size(mat);

 for i=::m

     for j=::n

         if j==n

             if (type==)

                  fprintf(fid,'%g\n',mat(i,j));

             elseif (type==)

                  fprintf(fid,'%s\n',mat(i,j));

             end

         else

              if (type==)

                  fprintf(fid,'%g\t',mat(i,j));

              elseif (type==)

                  fprintf(fid,'%s\t',mat(i,j));

             end

         end

     end

 end

 fclose(fid);

 flag=;

 end

2.强制刷新

drawnow;%强制刷新

3.动态增加数组

curR=[R t;[0 0 1]];

lineSeg=[1;1];

lineSeg=[lineSeg [1; 1]];

4.线段拟合函数

polyfit

5.非线性最小二乘优化

lsqnonlin

6.绘制包围盒 http://www.mathworks.com/matlabcentral/fileexchange/54463-drawboundingbox3d-xbnd-ybnd-zbnd-linewidth-color-/content/drawBoundingBox3d.m

function  DrawBoundingBox(xBnd,yBnd,zBnd,lineWidth,color)

% DrawBoundingBox(xBnd,yBnd,zBnd,lineWidth,color)

%

% This function draws the wireframe box that as described by the limits in

% xBnd, yBnd, and zBnd

%

% INPUTS:

%   xBnd = [xLow, xUpp]

%   yBnd = [yLow, yUpp]

%   zBnd = [zLow, zUpp]

%

hold on;

% Draw the bottom:

plot3(...

    xBnd([1,1,2,2,1]),...

    yBnd([1,2,2,1,1]),...

    zBnd([1,1,1,1,1]),...

    'LineWidth',lineWidth','color',color);

% Draw the top:

plot3(...

    xBnd([1,1,2,2,1]),...

    yBnd([1,2,2,1,1]),...

    zBnd([2,2,2,2,2]),...

    'LineWidth',lineWidth','color',color);

% Draw the sides:

plot3(...

    xBnd([1,1]),...

    yBnd([1,1]),...

    zBnd([1,2]),...

    'LineWidth',lineWidth','color',color);

plot3(...

    xBnd([1,1]),...

    yBnd([2,2]),...

    zBnd([1,2]),...

    'LineWidth',lineWidth','color',color);

plot3(...

    xBnd([2,2]),...

    yBnd([2,2]),...

    zBnd([1,2]),...

    'LineWidth',lineWidth','color',color);

plot3(...

    xBnd([2,2]),...

    yBnd([1,1]),...

    zBnd([1,2]),...

    'LineWidth',lineWidth','color',color);

end

7.matlab中小数取整的函数大约有四个：floor、ceil、round、fix

8.plot3函数绘制点的大小

plot3(model(1,:),model(2,:),model(3,:),'r.',data(1,:),data(2,:),data(3,:),'b.','MarkerSize',1), hold on, axis equal

9.运行时间计算

tic;

time=toc;

10.绘制箱线图

11.matlab plot函数绘制点符号

符号

[ + | o | * | . | x | square | diamond | v | ^ | > | < | pentagram | hexagram | - | : ]

"+"："+"形线

"o"："o"形线

"*"："*"形线

"."："."形线

"v"："v"形线

"^"："^"形线

">"：">"形线

"<"："<"形线

"square": 正方形

"pentagram": 五角形

"hexagram": 六角形

"-": 实线

":": 虚线

颜色

[ y | m | c | r | g | b | w | k ]

y: 黄色

m: 粉红

c: 亮蓝

r: 大红

g: 绿色

b: 蓝色

w: 白色

k: 黑色

12.set(gcf,'Color',[1,1,1]); % 修改背景色

Square

Matlab代码备忘