Array indices must be positive integers or logical values. Error in (line 8) mr(t)=mi-(​(mi-mf)*(t​./tb));

mi=2290000
mf=130000
tb=165
t= linspace(6.5,165,1);
mr(t)=mi-((mi-mf)*(t./tb));
mr=[]
for t=6.5:165;
     mr(t)=mi-((mi-mf)*(t./tb));
end

I have no idea what's wrong with the for loop, and I don't see an error in line 8. Any help please?

Answer 1

[Stephan]

I doubt you want t to have only one point. Also no for loop is needed:

mi=2290000;
mf=130000;
tb=165;
t=linspace(6.5,165);
mr=mi-((mi-mf)*(t/tb));
plot(t,mr)

[Chukwunememma Uponi]

thank you!

Answer 2

[Rafael Hernandez-Walls]

Hi,

Yo have 2 errors. First you have the line when you define the vector time:

t=linspace(6.5,164,1) % You need to put the number of points (you have only one point)

You dont need to put mr(t), because t isnt integer and you need a integer (is a index of the vector). you need to put only this line

mr=mi-((mi-mf)*(t./tb));

You dont need the loop for

Rafael

[Chukwunememma Uponi]

thank you!

Answer 3

[Image Analyst]

You can't have the 6.5th element of an array. You can have the 6th or 7th but not the 6.5th. Your question is a FAQ, so read the FAQ on it, plus on several other common errors and other fascinating things.

Click here for the FAQ