Keep getting Matrix dimensions must agree warning

I am attempting to plot the Gas Turbine efficiency as a function of the temperature ratio:

Tr=1:10<3;
n=1-1/Tr;
figure
plot(Tr,n)

When attempting to plot i get the following error:

Error in ==> test at 5
n=1.-1/Tr;

??? Error using ==> mrdivide
Matrix dimensions must agree.

 Any help would be appreciated, thanks in advance.

Answer 1

[TastyPastry]

You need to use element by element division, which is "./".

Answer 2

[Star Strider]

I do not know what you intend with this assignment:

Tr=1:10<3;

since it creates this logical array:

Tr =
     1     1     0     0     0     0     0     0     0     0

Which is likely not what you want, because it creates with this assignment:

n=1-1./Tr;

this result for ‘n’:

n =
     0     0    -Inf     -Inf     -Inf     -Inf     -Inf     -Inf     -Inf     -Inf