If elseif else end function

Question

son 2014-8-23

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/152074-if-elseif-else-end-function

回答： Image Analyst 2014-8-23

hi, i am writing the code that follows

 L=1:1:10;
  choice = menu('Choose the case','case1','case2','case3','case4');
 if choice==1
    a = 1;
    b=2;
    c=3; 
elseif choice==2
    a = 6;
    b=8;
    c=9;
else
   a = 2;
   b=6;
   c=8;
end
  x=(a/b)^c.*L;
  plot(L,x)

but now i want to add case 4 which will plot all three case in one graph? i can do it by calling a1,a2,a3... and so on then plot L1, L2, L3 for 3 case above in 1 graph

but actually my programme is so much bigger than this simple example. Do u have any other suggestion?

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Answer 1

Matt J 2014-8-23

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https://ww2.mathworks.cn/matlabcentral/answers/152074-if-elseif-else-end-function#answer_149615

编辑：Matt J 2014-8-23

在 MATLAB Online 中打开

Do more vectorized processing. The following is easily extendable to more data

     a=[1 6 2];
     b=[2 8 6];
     c=[3,9,8];
     coeff=(a./b).^c;

Then you can simply do

    for choice=1:length(coeff)
     plot(L,coeff(choice).*L); hold on
    end
    hold off

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Matt J 2014-8-23

编辑：Matt J 2014-8-23

在 MATLAB Online 中打开

Or,

    N=length(coeff);
    args(2,1:N)=num2cell(L.'*coeff,1);
    args(1,:)={L};
    plot(args{:});

son 2014-8-23

i mean the first 3 case above will produce 1 plot . and then the final case will produce 3 line in 1 graph.

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Answer 2

Image Analyst 2014-8-23

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/152074-if-elseif-else-end-function#answer_149624

在 MATLAB Online 中打开

Try this:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 13;
L=1:1:10;
a=[1 6 2];
b=[2 8 6];
c=[3,9,8];
choice = menu('Choose the case','case1','case2','case3','case4')
if choice<= 3
  indexes = choice
else
  indexes = 1:3
end
x= (a(indexes) ./ b(indexes)) .^ c(indexes) .* L(indexes);
plot(L(indexes), x, 'b*-', 'LineWidth', 2, 'MarkerSize', 15);
grid on;