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

Question

Michael Clopton 2020-5-21

0
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https://ww2.mathworks.cn/matlabcentral/answers/529578-need-help-writing-an-if-statement-to-change-a-plots-name-based-on-the-data-plotted

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

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dpb 2020-5-21

Your first clause/error test will still pass thru a zero number of sides
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...

Michael Clopton 2020-5-23

Thanks

此问题已关闭。

Answer 1

Monalisa Pal 2020-6-22

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/529578-need-help-writing-an-if-statement-to-change-a-plots-name-based-on-the-data-plotted#answer_455173

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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