Listing values for a variable to be solved to an equation

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Barry Akenga 2017-5-1

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回答： hmi amid 2017-5-1

I am trying to solve for T, time taken to corrosion initiation time using the relative code and equation: X = 0.01; Co = 3.5; D = 5*10^-5; Cth = 0.9; E = erfinv(Cth / Co); T = X^ 2 / [4 * D *( E ^ 2)] Ti= mean(T); Tt= std(T); y = lognpdf(T,Ti,Tt); plot(T,y); grid; Where my question arises is that I am trying to list values for X and so far the code solves for X= 0.01 however I want to solve for T using a range X=0-0.04.What type of code should I use for it? Thanks

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Answer 1

hmi amid 2017-5-1

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Hi you should use an array for your X :

 X = 0.00:0.001:0.04;
 Co = 3.5; D = 5*10^-5; Cth = 0.9; E = erfinv(Cth / Co);
 T = X.^ 2 / [4 * D *( E ^ 2)];
 Ti= mean(T);
 Tt= std(T);
 y = lognpdf(T,Ti,Tt);
 plot(T,y); grid;

Here the X value goes from 0 to 0.04 with a step of 0.001 And also be careful to put a dot before ^ in X.^2 because it should consider the square of each element in the array.

Amid.