How can I find my X value given my Y value

Hi all,

I'm not really sure what the right answer is. I've tried to use everything I know and I'm still not sure. I'm trying to get my code to output the first T value that the reaction rate value is greater than 0.1. I can find the reaction rate value, but I'm not sure how to code finding the T value after that. I'm not sure if I even coded it the right way for finding the first reactionRate value greater than 0.1. Thank you for all your help!

function[Q,R,Ko,T]=IsbisterLab11() %inputs of the function are Q,R,Ko,T

R=1.987; % cal/mol K

Q=8000;%cal/mol

Ko=1200; %min^-1

T=linspace(100,500,200); %in Kelvin

reactionRate=Ko*exp((-Q)./(R.*T)); %Given formuldisp('Table showing temperature and the corresponding reaction rate value');

x=table(T',reactionRate');% Setting up the table

x.Properties.VariableNames={'Temperature' 'Reaction Rate'};% Giving the Columns of the table names

find(0.1,1,'first')%finding the r value that is greater than 0.1

[CMdC]

I think you have to put the Outputs before a functionand not the inputs. Check it.

Like Function [outputs] = IsbisterLab11 (inputs here);

Check it out I am very beginner I am not sure.

Answer 1

[Athrey Ranjith Krishnanunni]

There are two major bugs here:

1. Incorrect function declaration syntax, as @CMdeCarli has pointed out, and
2. Improper use of the find function.

To fix them, rewrite your function as the following:

function Tval = IsbisterLab11(Q, R, Ko, T)  %inputs of the function are Q,R,Ko,T
    
    reactionRate = Ko * exp(-Q./(R.*T)); % Given formula
    
    % create table and display it
    x = table(T',reactionRate'); % Setting up the table
    x.Properties.VariableNames = {'Temperature', 'ReactionRate'}; % names of columns
    disp('Table showing temperature and the corresponding reaction rate value');
    disp(x)
    
    % find the first index of reactionRate that is greater than 0.1
    idx = find(reactionRate > 0.1, 1, 'first');
    
    Tval = T(idx); % corresponding T value
    
end

and call it like this:

R = 1.987; % cal/mol K
Q = 8000; % cal/mol
Ko = 1200; % min^-1
T = linspace(100,500,200); % in Kelvin
Tval = IsbisterLab11(Q, R, Ko, T)

Your earlier variable name 'Reaction Rate' is not valid because it has a space in between.