帮助在 Matlab 中使用紧凑数组运算来替换 for 循环
我需要模拟森林火灾，为此，我需要一个色彩图。 颜色图有 51 行，如下所示：
前 10 行是从深绿色到黄色的渐变，行的生成方式为：
uint8color = [4 112 31];
for i = -1:8
cmap = double(uint8(uint8color + i*[30 27 3])) / 255
end;
接下来是一条蓝色线：
cmap(11, :) = [0 0.5 0.9];
其余 40 行从黄色到红色到几乎黑色，完成通过以下内容：
for i=19:-1:-20
farve = double(uint8(uint8farve + i*[12 12 5])) / 255;
end;
这工作得很好，但是，我想尽可能避免使用循环，并尝试使用 Matlab 能够执行的紧凑数组操作，
尽管如此，我仍然坚持上述内容，没有意识到如何（以及如果）我可以使用紧凑表示法，但手头仍然有索引。
对于前 10 行，类似于：
cmap(1:10, :)
将替换 for 循环，但它需要我以某种方式仍然提取索引并从值中减去 2 (1:10 -> -1:8)
我希望有一个 Matlab某处的大师，谁能指出我正确的方向
提前致谢
I need to simulate a forest fire and for this, I need a colormap.
The colormap has 51 rows, which looks like this:
First 10 is a gradient from dark green to yellow and the rows are generated by:
uint8color = [4 112 31];
for i = -1:8
cmap = double(uint8(uint8color + i*[30 27 3])) / 255
end;
Next is a single blue line:
cmap(11, :) = [0 0.5 0.9];
And the remaining 40 lines go from yellow over red to almost black, done by the following:
for i=19:-1:-20
farve = double(uint8(uint8farve + i*[12 12 5])) / 255;
end;
This works fine, however, I would like to avoid using loops wherever possible and try to use the compact array-operations Matlab is capable of
I'm quite stuck with the above though, not realising how (and if) I can use the compact notation, but still have the index at hand.
For the first 10 rows, something like:
cmap(1:10, :)
Would substitute the for-loop, but it would require me to somehow still extract an index and subtract 2 from the value (1:10 -> -1:8)
I hope there's a Matlab guru somewhere, who can point me in the right direction
Thanks in advance
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第一个循环可以重写为：
不过，我不太确定您想要通过所有这些强制转换实现什么目标......
The first loop can be rewritten as:
I'm not quite sure what you're trying to achieve with all those casts, though...