matlab提示 The expression to the left of the equals sign is not a valid target for an assignment

题目

matlab提示 The expression to the left of the equals sign is not a valid target for an assignment
for idx = 1:length(test{3})
eval([ test{1}{idx},' = ',num2str(test{3}(idx)),';']);
end
是哪儿不对呢

答案

一个等号表示赋值,两个等号才表示判断是否相等.你这里相当于向test{1}{idx}赋值,所以报错了.