how can i use for loop to solve the below problem

Add an if statement to the for loop body. If speed(c) is less than or equal to 0, create a loglog plot of s against lambda using a dashed line (--).

After the if statement, add the command hold on so that only one plot is created.

the below didnt work for me:

 if speed(c) <= 0
        loglog(lambda,s,"--")
    end
    hold on
end

[Geoff Hayes]

Chirstopher - please clarify what you mean by the below didn't work for me. The code seems correct (unless you should be plotting loglog(s,lambda,'--')?) so please post any error messages or discuss why it isn't doing what you expect.

[Christopher Achor]

Here is the error message as attached.

[Saurav Bhagasra]

for c = 1:7
           s = spectra(:,c)
 if speed(c) <=0
        loglog(lambda,s,"--")
 end
 hold on
end

Answer 1

[Abdolkarim Mohammadi]

You have used an extra end. Delete the end in the last line. I think you must use hold on before your for loop and place the if inside the for loop.

Answer 2

[Damrudhar]

Add an else statement. If speed(v) is greater than 0, create a plot of s against lambda using a line width of 3.

After the for loop, enter hold off.

[Gemma Lyn]

for v = 1:7
    s = spectra(:,v)
    if speed(v) <=0
        plot(lambda,s,"--")
    else speed(v) >0
        plot(lambda,s,LineWidth=3)
    end
        hold on
end
hold off

Answer 3

[Khotso]

for v = 1:7 s = spectra(:,v) if speed(v) <=0 plot(lambda,s,"--") else speed(v) >0 plot(lambda,s,LineWidth=3) end hold on end hold off