I have sigmoid graph and I want to stop the time until 4th and continue from day 10th until day 30th. Can I make like this?

M1(1)=0;
t(1)=0;
h=0.01;
dt=-5:h:30;
t=zeros(length(dt),1);
M1=zeros(length(dt),1);
for i= 1:length(dt)
    t(i+1)=t(i)+h*i;
    M11=M1(i)+1./(1+exp(-dt)); 
end

plot(dt,M11,'k','Linewidth',3);
xlabel('Time (day)','Fontsize',14,'FontWeight','bold');
ylabel('Concentration (g/mL)','Fontsize',12,'FontWeight','bold');

[Mathieu NOE]

hello

not sure if I understand right , do you want to break your x axis so the portion between 4th and 10th day is eliminated ?

Break X-axis in Matlab - MATLAB Answers - MATLAB Central (mathworks.com)

[Torsten]

You overwrite M11 every time you pass your loop. The result you plot is the same as if you define M11 as

h=0.01;
dt=-5:h:30;
M11 = 1./(1+exp(-dt));
plot(dt,M11)

[cindyawati cindyawati]

Thank you for your response, I mean I want to break the graph until 15 th and continue the graph from 25th. It is possible?

[Mathieu NOE]

hello @cindyawati cindyawati

see this Fex submission

Break X Axis - File Exchange - MATLAB Central (mathworks.com)

you get this nice looking result with only one extra line of code : (and no need for the for loop as already mentionned by @Torsten)

h=0.01;
dt=-5:h:30;
M11 = 1./(1+exp(-dt));
plot(dt,M11)

%Break The Axes
h = breakxaxis([15 25]);

Answer 1

[Chunru]

M1(1)=0;
t(1)=0;
h=0.01;
dt=-5:h:30;
t=zeros(length(dt),1);
M1=zeros(length(dt),1);
for i= 1:length(dt)
    t(i+1)=t(i)+h*i;
    M11=M1(i)+1./(1+exp(-dt)); 
end

ind = dt>=15 & dt<=25;
M11(ind) = nan;

plot(dt,M11,'k','Linewidth',3);
xlabel('Time (day)','Fontsize',14,'FontWeight','bold');
ylabel('Concentration (g/mL)','Fontsize',12,'FontWeight','bold');