[转载]matlab中一些基本函数的应用
Matlab Ctrl+R
randceilfix
Nextpow2xx2---4364100128
Rectpulse intdump将多个采样点复合为一个点；
sum(a,1)表示求矩阵a
每列的和，sum（a，2）表示求矩阵每行的和；
Repmat B = repmat(A,M,N)
creates a large matrix B consisting of an M-by-N
tiling of copies of A. The size of B is [size(A,1)*M,
size(A,2)*N].
The statement repmat(A,N) creates an
N-by-N tiling
repmat(x,2,1)[x;x]x2*1
dataTx=rcosflt(dataTx1,fs/8,fs,'filter',num);dataTx82*delay*fs/fd,
downsample
dataTx=rcosflt(dataTx1,fs/8,fs,'fs/filter',num);
linspace(0,1,100)0-1100100
y&=&upsample(x,n)
increases the sampling rate of x by inserting
n-1 zeros between
samples0n-1
y&=&downsample(x,n)
decreases the sampling rate of x by keeping
every n，每隔（n-1）个点，抽取，相当于每3个点中，取一个
impulsesyssys&&&
stepsyssys
dimpulsenum,den
FIRden[1 0 0 0 …]&
&&=&FIRFIR
Y=rand(3,4)3*4,
Y=randint(3,4,16)163*4
Y=randn(3,4)3*4
ReshapershapeA,m,nm*n
Title([‘this
is’, num2str(iEbN0dB),’dB’]);fig
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