problem using hold on in a for loop

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Rebekah Kuehl 2019-7-16

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https://ww2.mathworks.cn/matlabcentral/answers/471964-problem-using-hold-on-in-a-for-loop

评论： David K. 2019-7-16

For my project, I am calculating the half-life of an organism based on radioactive decay. My code is below. The problem I am experiencing is that he figure only has one point plotted. If someone could explain how to fix this so my entire function would be plotted, that would be greatly appreciated.

function Project
clc, clear
P=menu ('Please choose the element', 'Pm-145', 'Po-209', 'Ra-226', 'Ac-227', 'Am-243', 'Bk-247', 'Cf-251', 'C-14');
switch P %P=element found in sample through AMS
    case 1          % Promethium-145
        t=17.4;
    case 2          % Polonium-209
        t=102;
    case 3          % Radium-226
        t=1600;
    case 4          % Actinium-227
        t=21.77;
    case 5          % Americium-243
        t=7370;
    case 6          % Berkelium-247
        t=1380;
    case 7          % Californium-251
        t=898;
    case 8          % Carbon-14
        t=5730;
end
N=input ('Please enter the remaining percentage of substance: \n');
while N<=0 || N>=100 %N=percentage of element found through AMS 
    fprintf ('Incorrect input. Please try again. \n');
    N=input ('Please enter the remaining percentage of substance: \n');
end
clc
age=(((log((N)/(100)))/(-0.693))*t);
fprintf ('The age of your organism is shown below: \n');
fprintf (' %s years',age);
n=length(N);
for i=1:n
    plot(age(i), N(i), '*', 'MarkerSiz', 10)
    xlim([0 inf])
    ylim([0 100])
    pause(.01)
    hold all
    xlabel(strcat('Years passed = ', num2str(age(i))))  
    ylabel(strcat('Percentage remaining =', num2str(N(i)))) 
    title ('Radioactice Decay')
    grid on
end
end

Thanks!

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Rebekah Kuehl 2019-7-16

The input requested is a percentage, so the while loop is used to get an appropriate number. For example, if the user inputs a negative number or one larger than 100, the program will not run because those are not acceptable percentages