Matlab代码备忘

1.Matlab读取和写入文件 

%读取数据
name=strcat('ptsinterval90_00000',num2str(0),'.txt');
fid=fopen(name,'r');
sizeA=[4 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
',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 1 数字
% type 2 字符
fid=fopen(filename,'wt');%写入文件路径 
[m,n]=size(mat); 
for i=1:1:m 
    for j=1:1:n 
        if j==n 
            if (type==1)
                 fprintf(fid,'%g
',mat(i,j)); 
            elseif (type==2)
                 fprintf(fid,'%s
',mat(i,j)); 
            end
        else 
             if (type==1)
                 fprintf(fid,'%g	',mat(i,j)); 
             elseif (type==2)
                 fprintf(fid,'%s	',mat(i,j)); 
            end
        end 
    end 
end 
fclose(fid);
flag=1;
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