The code provided is not recognizing the decimal_Fm as a variable, making this function uselless when placed into another m file. Any suggestions?

function percent_Fm = sarcomere_force(percent_L)
decimal_L = percent_L/100;
L = decimal_L*2.7; % micrometers
if 1.35<=L && L<=1.91
    decimal_Fm = 1.41*L-1.91
elseif 1.91<L && L<=2.37
    decimal_Fm = 0.40*L+0.04
elseif 2.37<L && L<=2.71
    decimal_Fm = 0.04*L+0.89
elseif 2.37<L && L<=4.53
    decimal_Fm=-0.50*L+2.35
end
percent_Fm = decimal_Fm*100;

As a note, I know there is no percent_L given. That is something solved for in the other m file.

Answer 1

[Mathieu NOE]

hello

I fixed your code :

1. the function was missing and else statement in case the L values are not in the numerical range already coded. For this case you have to decide what value (or leave empty) you want.
2. the function(s) are always located at the lower end of the script, you do the function call above the function script

clc
clearvars

%% main code
percent_L = 100;
percent_Fm = sarcomere_force(percent_L);

%% functions
function percent_Fm = sarcomere_force(percent_L)
    decimal_L = percent_L/100;
    L = decimal_L*2.7; % micrometers
    if 1.35<=L && L<=1.91
     decimal_Fm = 1.41*L-1.91;
    elseif 1.91<L && L<=2.37
     decimal_Fm = 0.40*L+0.04;
    elseif 2.37<L && L<=2.71
     decimal_Fm = 0.04*L+0.89;
    elseif 2.37<L && L<=4.53
     decimal_Fm=-0.50*L+2.35;
    else % here
     decimal_Fm=[]; % or ??? to be defined
    end
    
    percent_Fm = decimal_Fm*100;

end

[Kevinjw16]

So, two things:

1) the percent_L isn't 100. Its a value calculated in the other m file

2) If I add the else -> decimal_Fm=[ ] into my code, it says it is an "illegal use of reserved keyword 'else'"

[Kevinjw16]

As a new update: I had the else portion after end, giving me the error message.

[Mathieu NOE]

hello

for your function you need and additionnal "end" - that was missing in your code

• there must be one "end" for the if loop
• a second end to "close" the function

see my code example and double check yours

function percent_Fm = sarcomere_force(percent_L)
    decimal_L = percent_L/100;
    L = decimal_L*2.7; % micrometers
    if 1.35<=L && L<=1.91
     decimal_Fm = 1.41*L-1.91;
    elseif 1.91<L && L<=2.37
     decimal_Fm = 0.40*L+0.04;
    elseif 2.37<L && L<=2.71
     decimal_Fm = 0.04*L+0.89;
    elseif 2.37<L && L<=4.53
     decimal_Fm=-0.50*L+2.35;
    else % here
     decimal_Fm=[]; % or ??? to be defined
    end
    
    percent_Fm = decimal_Fm*100;
end