having problems troubleshooting this code (vertcat syntax)
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I've been having trouble making this code work, I am trying to make a program that returns the roots of a polynominal, along with if the roots are complex or not based on the discriminant. I keep getting the 'vertcat' syntax. can anyone help point out the error in my code?
function [r] = quadratic(~)
q_fields = {'Coefficient "a"',...
'Coefficient "b"',...
'Coefficient "c"'};
tboxtitle = 'Coefficient Input Menu';
co_values = inputdlg(q_fields,tboxtitle);
a = str2num(co_values{1});
b = str2num(co_values{2});
c = str2num(co_values{3});
x1 = (-1*b + (sqrt(b^2.-(4*a*c))))/(2*a);
x2 = (-1*b - (sqrt(b^2.-(4*a*c))))/(2*a);
x1 = num2str(x1);
x2 = num2str(x2);
d = b^2.- (4*a*c);
d = num2str(d);
if d > 0
r = msgbox(['The roots for your selected coefficients are ',x1,' and ',x2; ...
'There are 2 real roots']);
elseif d == 0
r = msgbox(['The roots for your selected coefficients are ',x1,' and ',x2; ...
'There is 1 real root']);
elseif d < 0
r = msgbox(['The roots for your selected coefficients are ',x1,' and ',x2; ...
'There are 2 imaginary roots']);
end
end
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回答（1 个）
function [r] = quadratic(~)
q_fields = {'Coefficient "a"',...
'Coefficient "b"',...
'Coefficient "c"'};
tboxtitle = 'Coefficient Input Menu';
co_values = inputdlg(q_fields,tboxtitle);
a = str2num(co_values{1});
b = str2num(co_values{2});
c = str2num(co_values{3});
x1 = (-1*b + (sqrt(b^2.-(4*a*c))))/(2*a);
x2 = (-1*b - (sqrt(b^2.-(4*a*c))))/(2*a);
x1 = num2str(x1);
x2 = num2str(x2);
d = b^2.- (4*a*c);
d = num2str(d);
if d > 0
r = msgbox(['The roots for your selected coefficients are ',x1,' and ',x2, ...
'There are 2 real roots']); % ^
elseif d == 0 % |
r = msgbox(['The roots for your selected coefficients are ',x1,' and ',x2, ...
'There is 1 real root']); % ^
elseif d < 0 % |
r = msgbox(['The roots for your selected coefficients are ',x1,' and ',x2, ...
'There are 2 imaginary roots']); % ^
% |
end % |
end % HERE , instead ;
3 个评论
Steven Lord
2020-11-2
That will put all the text on one line. If the intent was to put the second part on a separate line, I'd replace the semicolon with newline. As an example of what this looks like for one of those lines:
r = msgbox(['The roots for your selected coefficients are ',x1,' and ',x2, newline, ...
'There are 2 real roots']);
Bailey Owen Banks
2020-11-2
Stephan
2020-11-2
Why not post your solution as an answer. May be interesting for others facing the same problem.
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2021-8-20
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