Matlab: Tips and tricks
2007-11-10 13:18
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快速删除元素: x(3:5) = [];
翻转向量:x = x(end:-1:1)
速度比较,下面哪个快呢?
tic; x = x(end:-1:1);toc
tic; x = fliplr(x); toc
快速创建一个值全是#(一个数字)的矩阵:
下面哪个快呢?
tic; x=2*ones(2000,2000); toc;
tic; x=repmat(2,2000,2000); toc;
那下面哪个快呢?
tic; x=ones(2000,2000); toc;
tic; x=repmat(2,2000,2000); toc;
获取N维数组的最大值:max(x(:));
如果我同时也想得到最大值的坐标呢?
[Y ind]=max(x(:));
[rowsub,colsub,sub3...,subN]=ind2sub(size(x),ind);
n点均匀采样:x = 0:1/(n-1):1
它有x = linspace(0,1,n);快么?
请优先选用 红色代码。
翻转向量:x = x(end:-1:1)
速度比较,下面哪个快呢?
tic; x = x(end:-1:1);toc
tic; x = fliplr(x); toc
快速创建一个值全是#(一个数字)的矩阵:
下面哪个快呢?
tic; x=2*ones(2000,2000); toc;
tic; x=repmat(2,2000,2000); toc;
那下面哪个快呢?
tic; x=ones(2000,2000); toc;
tic; x=repmat(2,2000,2000); toc;
获取N维数组的最大值:max(x(:));
如果我同时也想得到最大值的坐标呢?
[Y ind]=max(x(:));
[rowsub,colsub,sub3...,subN]=ind2sub(size(x),ind);
n点均匀采样:x = 0:1/(n-1):1
它有x = linspace(0,1,n);快么?
请优先选用 红色代码。
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