Trying to plot radioactive decay equation

I am trying to plot a radioactive decay equation. I have attached a screen shot of my current code and a picture of the final result that I need to go get to. Why is my current code not working? Matlab won't plot it.

[Star Strider]

Your x and y labels are reversed.

Answer 1

[Mischa Kim]

Daniel, you can simply do

lambda = log10(2)/5700;
x = 1:100;
y = (-1/lambda)*log10(x/100);
plot(x,y)

Answer 2

[Ayesha Altaf]

function matlab

clc;clear;

%Radioactive decay

y0=[5*10^26;0];

soln = ode23(@f1,[0 8],y0)

t = linspace(0,8,24);

y(:,1)=deval(soln,t,1); %Strontium

y(:,2)=deval(soln,t,2); % Yttrium

figure

plot(t,y(:,1),'-o',t,y(:,2),'--');

hold on;grid on;

legend('Strontium','Yttrium')

end

function dxdt = f1(x,t)

r1 = 0.256;

r2 = 0.127;

dxdt(1) = -r1 * x;

dxdt(2) = -r2 * x;

dxdt =dxdt';

end

function matlab

↑

Error: Function definition not supported in this context. Create functions in code file.

what's wrong with this code. why it show error can anyone tell?

Answer 3

[Narayan guragain]

clear all

clc

%%Radioactive Decay%%

N0=5*10^22;

lemda=0.25;

t=[0:10];

N=N0*exp(-lemda.*t);

plot(t,N,"r");

xlabel("Half Life");

ylabel("Particles Undecayed");

title("Radioactive Decay");