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Need help writing an if statement to change a plots name based on the data plotted

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Michael Clopton
Michael Clopton 2020-5-21
关闭： MATLAB Answer Bot 2021-8-20
The code I have so far is as follows it creates a graph that is a polygon and sides are determined based on user input.
function quiz31(~)
sides = input('input the number of sides you want;, ');
if sides <= 0
sides = sides *-1;
disp('only positive numbers allowed')
end
if sides == 5
title('Pentagon')
elseif sides == 3
title('Triangle')
elseif sides == 6
title('Hexagon')
else side == 4;
title('square')
end
degrees=2*pi/sides;
theta=0:degrees:2*pi;
radius=ones(1,numel(theta));
polarplot(theta,radius)
end
  2 个评论
dpb
dpb 2020-5-21
  1. Your first clause/error test will still pass thru a zero number of sides
  2. So you set a title; what you're missing is that you need to save the name to a variable in the logic and then add the title after you plot the graph...

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回答（1 个）

Monalisa Pal
Monalisa Pal 2020-6-22
Are you looking for something like this?
function quiz31(~)
sides = input('input the number of sides you want;, ');
if sides <= 0
%sides = sides *-1;
%disp('only positive numbers allowed')
error('only positive numbers allowed');
elseif (sides ~= 5) && (sides ~= 3) && (sides ~= 6) && (sides ~=4)
error('only 2, 3, 5 or 6 sides are allowed');
end
if sides == 5
%title('Pentagon')
str = 'Pentagon';
elseif sides == 3
%title('Triangle')
str = 'Triangle';
elseif sides == 6
%title('Hexagon')
str = 'Hexagon';
elseif sides == 4
%title('square')
str = 'square';
end
degrees=2*pi/sides;
theta=0:degrees:2*pi;
radius=ones(1,numel(theta));
polarplot(theta,radius);
title(str);
end

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