Question

我有一个称为指标的矩阵表(1X4000);第1栏至2000年包含双重价值0,第2001至4000栏含有双重价值1

a) i want to create a matrix called targets_1 where i want to check if the value is 0 then make the entry 1 so at the end of the day i must have a matrix with :column 1 to 2000 with value 1 and column 2001:4000 with value zero

b) Same situation as above but this time i want to check if the value is 1 then make the entry 1 and if it is zero then make the entry zero; at the end; my new matrix targets_2 contains values: column 1 to 2000 with value zero and column 2001:4000 with value 1

i 知道如何利用扼杀功能来进行这种检查,但问题是,我的原始矩阵是双重的,而且我知道是否有这样的功能。

set Cmp = 症状(植物、物种);

能够重复工作(数目);任何帮助都值得赞赏。

Answer 1

我把这一答案完全基于以下事实:你提到setosaCmp = strcmp(植物、物种);。从这个角度看,

You have Statistics Toolbox, as setosa is a species of iris from the Fisher Iris dataset widely used in Statistics Toolbox demos, and
You have a variable containing class labels, and you d like to construct some class indicator variables (i.e. a new variable for each class label, each of which is 1 when the item is in that class, and 0 when it s not).

这项权利吗? 否则,请忽视我。

如果我不胜诉,那么我认为你从统计工具箱中重新寻找的指令是<编码>dummyvar。为此:

>> classLabels = [1, 2, 1, 2, 3, 1, 3];
>> dummyvar(classLabels)
ans =
 1     0     0
 0     1     0
 1     0     0
 0     1     0
 0     0     1
 1     0     0
 0     0     1

Answer 2

你的问题非常清楚。如下文所示:

targets_1 = 1 - targets;
targets_2 = targets;

Answer 3

targets1 = double(targets == 0);
targets2 = targets;

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