Saying Else is invalid syntax

Question

Gurinder Punni 2020-9-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/599482-saying-else-is-invalid-syntax

编辑： Sindar 2020-9-25

在 MATLAB Online 中打开

So, I'm writing a function to calculate the dot product in various ways and then find the angle between 2 vectors.

However, I keep getting a parse invalid syntax error for my first else statment.

Here is the code:

It is the most bottomest else that is getting the error.

function [d1,d2,d] = dotangle(u,v)
m = length(u);
n = length(v);
if isequal(uEntries,vEntries) == 1 
    fprintf('both vectors have %i entries\n',n)
    d1 = transpose(u)*v;
    d2 = 0; 
    for i= 1:m 
        for j = 1:n 
            d2 = d2 + u(i,j)*v(i,j);
        end
    end 
    d = dot(u,v); 
    if d1 == d2 && d2 == d
        fprinitf('the code is correct\n');
        uMag = norm(u);
        vMag = norm(v);
        Theta = acosd(d/(uMag*vMag));
        if 90 == closetozeroroundoff(Theta) 
            disp('The angle between the vectors is 90 degrees.');
        elseif 0 == closetozeroroundoff(Theta) 
            disp('The angle between the vectors is zero');
        elseif 180 == closetozeroroundoff(Theta) 
            disp('The angle between the vectors is 180 degrees');
        else 
            if Theta < 90 
               fprintf('Angle between vectors is acute and its value theta = %d\n',Theta);
            elseif Theta > 90 
                fprintf('Angle between vectors is obtuse and its value theta = %d\n',Theta);
            end 
        end 
    end 
    else 
        disp('check the code!');
        return  
else
    disp('the dot product is not defined')
    d1 = [];
    d2 = [];
    d = [];
    return 
end 
end 

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Answer 1

Sindar 2020-9-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/599482-saying-else-is-invalid-syntax#answer_500074

编辑：Sindar 2020-9-25

在 MATLAB Online 中打开

you have two else's for the same if. Select it all and hit CTRL-i to smart indent to see:

function [d1,d2,d] = dotangle(u,v)
m = length(u);
n = length(v);
if isequal(uEntries,vEntries) == 1
    fprintf('both vectors have %i entries\n',n)
    d1 = transpose(u)*v;
    d2 = 0;
    for i= 1:m
        for j = 1:n
            d2 = d2 + u(i,j)*v(i,j);
        end
    end
    d = dot(u,v);
    if d1 == d2 && d2 == d
        fprinitf('the code is correct\n');
        uMag = norm(u);
        vMag = norm(v);
        Theta = acosd(d/(uMag*vMag));
        if 90 == closetozeroroundoff(Theta)
            disp('The angle between the vectors is 90 degrees.');
        elseif 0 == closetozeroroundoff(Theta)
            disp('The angle between the vectors is zero');
        elseif 180 == closetozeroroundoff(Theta)
            disp('The angle between the vectors is 180 degrees');
        else
            if Theta < 90
                fprintf('Angle between vectors is acute and its value theta = %d\n',Theta);
            elseif Theta > 90
                fprintf('Angle between vectors is obtuse and its value theta = %d\n',Theta);
            end
        end
    end
else
    disp('check the code!');
    return
else
    disp('the dot product is not defined')
    d1 = [];
    d2 = [];
    d = [];
    return
end
end