MATLAB: Will multiple ifelses not work

helpifelsereservedword

I have been trying to make a simple program that has you input the constants from a set of equations so that you dont have to write the full fromatting of the matrices each time. It works in chunks but when I put it together it says "Illegal use of reserved keyword "elseif"" I checked around and it seems you should be able to use multiple elseifs if you need to. If i use one elseif it is fine but once i add the second it wont work.
The code:
dim=input('How many equations' );
    if dim>7
        A=input('enter constants in matrix form' );
        b=input('enter constants in matrix form' );
    elseif dim==7
        A=[input('E1 Insert first constant' ) input('E1 Insert second constant' ) input('E1 Insert third constant' ) input('E1 Insert fourth constant' ) input('E1 Insert fifth constant' ) input('E1 Insert sixth constant' ) input('E1 Insert seventh constant' );input('E2 Insert first constant' ) input('E2 Insert second constant' ) input('E2 Insert third constant' ) input('E2 Insert fourth constant' ) input('E2 Insert fifth constant' ) input('E2 Insert sixth constant' ) input('E2 Insert seventh constant' );input('E3 Insert first constant' ) input('E3 Insert second constant' ) input('E3 Insert third constant' ) input('E3 Insert fourth constant' ) input('E3 Insert fifth constant' ) input('E3 Insert sixth constant' ) input('E3 Insert seventh constant' );input('E4 Insert first constant' ) input('E4 Insert second constant' ) input('E4 Insert third constant' ) input('E4 Insert fourth constant' ) input('E4 Insert fifth constant' ) input('E4 Insert sixth constant' ) input('E4 Insert seventh constant' );input('E5 Insert first constant' ) input('E5 Insert second constant' ) input('E5 Insert third constant' ) input('E5 Insert fourth constant' ) input('E5 Insert fifth constant' ) input('E5 Insert sixth constant' ) input('E5 Insert seventh constant' );input('E6 Insert first constant' ) input('E6 Insert second constant' ) input('E6 Insert third constant' ) input('E6 Insert fourth constant' ) input('E6 Insert fifth constant' ) input('E6 Insert sixth constant' ) input('E6 Insert seventh constant' );input('E7 Insert first constant' ) input('E7 Insert second constant' ) input('E7 Insert third constant' ) input('E7 Insert fourth constant' ) input('E7 Insert fifth constant' ) input('E7 Insert sixth constant' ) input('E7 Insert seventh constant' )]
        b=[input('First answer' );input('Second answer' );input('Third answer' );input('Fourth answer' );input('Fifth answer' );input('Sixth answer' );input('Seventh answer' );
    elseif dim==6
        A=[input('E1 Insert first constant' ) input('E1 Insert second constant' ) input('E1 Insert third constant' ) input('E1 Insert fourth constant' ) input('E1 Insert fifth constant' ) input('E1 Insert sixth constant' );input('E2 Insert first constant' ) input('E2 Insert second constant' ) input('E2 Insert third constant' ) input('E2 Insert fourth constant' ) input('E2 Insert fifth constant' ) input('E2 Insert sixth constant' ) ;input('E3 Insert first constant' ) input('E3 Insert second constant' ) input('E3 Insert third constant' ) input('E3 Insert fourth constant' ) input('E3 Insert fifth constant' ) input('E3 Insert sixth constant' ) ;input('E4 Insert first constant' ) input('E4 Insert second constant' ) input('E4 Insert third constant' ) input('E4 Insert fourth constant' ) input('E4 Insert fifth constant' ) input('E4 Insert sixth constant' );input('E5 Insert first constant' ) input('E5 Insert second constant' ) input('E5 Insert third constant' ) input('E5 Insert fourth constant' ) input('E5 Insert fifth constant' ) input('E5 Insert sixth constant' );input('E6 Insert first constant' ) input('E6 Insert second constant' ) input('E6 Insert third constant' ) input('E6 Insert fourth constant' ) input('E6 Insert fifth constant' ) input('E6 Insert sixth constant' )]
        b=[input('First answer' );input('Second answer' );input('Third answer' );input('Fourth answer' );input('Fifth answer' );input('Sixth answer' )]
    elseif dim==5
        A=[input('E1 Insert first constant' ) input('E1 Insert second constant' ) input('E1 Insert third constant' ) input('E1 Insert fourth constant' ) input('E1 Insert fifth constant' );input('E2 Insert first constant' ) input('E2 Insert second constant' ) input('E2 Insert third constant' ) input('E2 Insert fourth constant' ) input('E2 Insert fifth constant' );input('E3 Insert first constant' ) input('E3 Insert second constant' ) input('E3 Insert third constant' ) input('E3 Insert fourth constant' ) input('E3 Insert fifth constant' );input('E4 Insert first constant' ) input('E4 Insert second constant' ) input('E4 Insert third constant' ) input('E4 Insert fourth constant' ) input('E4 Insert fifth constant' );input('E5 Insert first constant' ) input('E5 Insert second constant' ) input('E5 Insert third constant' ) input('E5 Insert fourth constant' ) input('E5 Insert fifth constant' )]
        b=[input('First answer' );input('Second answer' );input('Third answer' );input('Fourth answer' );input('Fifth answer' );
    elseif dim==4
        A=[input('E1 Insert first constant' ) input('E1 Insert second constant' ) input('E1 Insert third constant' ) input('E1 Insert fourth constant' );input('E2 Insert first constant' ) input('E2 Insert second constant' ) input('E2 Insert third constant' ) input('E2 Insert fourth constant' );input('E3 Insert first constant' ) input('E3 Insert second constant' ) input('E3 Insert third constant' ) input('E3 Insert fourth constant' );input('E4 Insert first constant' ) input('E4 Insert second constant' ) input('E4 Insert third constant' ) input('E4 Insert fourth constant' )]
        b=[input('First answer' );input('Second answer' );input('Third answer' );input('Fourth answer' )]
    elseif dim==3
        A=[input('E1 Insert first constant' ) input('E1 Insert second constant' ) input('E1 Insert third constant' );input('E2 Insert first constant' ) input('E2 Insert second constant' ) input('E2 Insert third constant' );input('E3 Insert first constant' ) input('E3 Insert second constant' ) input('E3 Insert third constant' )]
        b=[input('First answer' );input('Second answer' );input('Third answer' );
    elseif dim==2
        A=[input('E1 Insert first constant' ) input('E1 Insert second constant' );input('E2 Insert first constant' ) input('E2 Insert second constant' )]
        b=[input('First answer' );input('Second answer' )]           
    else
    end

Best Answer

Your dim==7 case, the assignment to b does not end in ]
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