Eval with multiple lines

I have to run following with eval function in a single line.
a = 1:20; % first step is to define a variable
b = '[nan a(2:end)]'; % then index should be used. This should be in a single line.
c = eval(b);
My proposal is (which is wrong);
>> b = 'a = 1:20; [nan a(2:end)]'; % I need a single line such this
>> c = eval(b)
Error: The expression to the left of the equals sign is not a
valid target for an assignment.
There are some suggestions not to use eval. I have to use. Any help apreciated!

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Walter Roberson
Walter Roberson 2015-10-29

0 个投票

You cannot return a value from eval().
Does the assignment specifically require you to use eval()? We firmly discourage the use of eval().

4 个评论

I think I have to use it. Walter, will following code always work?
eval(b);
c = ans;
I do not know if it will always work; it might work.
Could you post a copy of the assignment text?
>> b = 'a = 1:20; [nan a(2:end)]'; % I need a single line such this
>> eval(b)
>> c = ans;
Right. Please post the text of the assignment.

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