[Keep Updating] Matlab Notes

# select a rectangle from an frame

[l r t b ] = select(iFrame);

# import data from a data file

info = importdata('info.txt')

# Read image to a Cell struct

for i = 1:N

　　F{i} = imread(img_i);

end

# Create an struct/class

st = struct('name','lp','id',7,'age',22);

# use a figure show image

figure(1),imshow(iFrame);

# Draw 3D map

// use mesh() and surf()

x=-4:0.1:4

y=-5:0.1:5

m = repmat(x,size(x),1);

n = repmat(y,size(y),1);

z = sqrt(m.^2 + n.^2)+eps;

z = sin(z)./z;

mesh(x,y,z);

surf(x,y,z);

# plot several figure in one picture

subplot(m,n,i);

imshow(img_i);

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