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Eval with multiple lines

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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!

Accepted Answer

Walter Roberson
Walter Roberson on 29 Oct 2015
You cannot return a value from eval().
Does the assignment specifically require you to use eval()? We firmly discourage the use of eval().
  4 Comments
Walter Roberson
Walter Roberson on 29 Oct 2015
Right. Please post the text of the assignment.

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