怎么写一个有正弦数据的矩阵，其他都是0。

大概是这样

0 0 0 1 0 0 0 0 0 0 0 0 0

0 0.5 0 0.5 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0.5 0 0.5 0

0 0 0 0 0 0 0 0 0 -1 0 0 0

Answer 1

[qxvdjfm]

clear;
JD=0:45:360;
JG=fix(2*sind(JD))/2
JG1=flip(unique(JG))
[~,row] = ismember(JG,JG1)
col=1:length(JD)

out=zeros(length(unique(JG)),length(JD))
out(sub2ind(size(out),row,col))=JG