MATLAB: Eval with multiple lines

assignmentevalmultiple 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!

Best Answer

You cannot return a value from eval().
Does the assignment specifically require you to use eval()? We firmly discourage the use of eval().
http://uk.mathworks.com/matlabcentral/answers/251329-can-i-execute-matlab-script-that-is-written-in-edit-box-in-a-gui-created-by-guide#answer_197570
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