How can I make a conditional statement when using variables?
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In my script I first defined a for loop:
for n = 1:inf
a = 10^(n+1);
b = 10*a;
so the for-loop assigns every iteration new values to my variables a and b.
Right after it I made an conditional statement:
if (a <= x)&&(x < b)
I want my value x (which I assign when activating the script) to lie between a and b. But matlab won't agree with me. It says:
Operands to the || and && operators must be convertible to logical scalar
values.
Error in palin (line 10)
if (a <= x)&&(x < b)
Though I thought values to the variables a and b were assigned earlier in the script, matlab would recognize these values. I was wrong. Does anybody has a suggestion what I could do to fix this error? I hope it is very easy to solve, so that soon someone will help me out of this. Thanks in advance.
采纳的回答
Wayne King
2013-12-24
编辑：Wayne King
2013-12-24
I'm guessing from the error message you report that x is a vector, not a scalar. From the code snippet you show, both a and b are scalars, x should be a scalar too.
So for example, look at the following
x = 10001;
for n = 1:3
a = 10^(n+1);
b = 10*a;
if (a <= x)&&(x < b)
disp('yes');
else
disp('no');
end
end
Now, if you try the above with x a vector
x = 10000:10004;
You'll get the error message you are seeing.
3 个评论
Maik Petersen
2013-12-24
Image Analyst
2013-12-24
I find it hard to believe that having the upper limit as 3 or something else, like inf, would cause it to work or fail. My guess is that you're changing x inside the loop and that if n is more than 3 somehow x turns into a vector. Does x appear at all in the loop other than the if statement? If so, are you concatenating/appending to it?
Maik Petersen
2013-12-24
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