How to iterate xa from 0 to 1 with steps of 0.05 in the function r=F(kC*(1-xa))/(1+KC(1-xa)). All variables are known except for r.

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Marina Gonzalez 2019-5-23

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评论： Star Strider 2019-5-23

采纳的回答： Star Strider

I have to iterate the conversion of a reaction (x) in order to get the different values of catalyst mass (m).

The conversion 'x' would go from 0 to 1 with spaces of 0.05.

The function I need to iterate is: m=F*(k_kin*C*(1-x))/(1+k_ads*C*(1-x))

I know the value of all the variables except for m, which is the mass that I'd like to calculate.

F=0.11574; k_kin=1.3*10^-6; C=1.086; k_ads=0.9986

Please, help me. I haven't used matlab in years and I've forgotten how to make a 'for' loop work.

Thank you in advance.

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madhan ravi 2019-5-23

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Star Strider 2019-5-23

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在 MATLAB Online 中打开

Everything except ‘x’ are scalars, so you can do this using a vectorization approach without the loop:

F=0.11574; k_kin=1.3*10^-6; C=1.086; k_ads=0.9986;
x = 0:0.05:1;
m=F*(k_kin*C*(1-x))./(1+k_ads*C*(1-x));
figure
plot(x, m)
grid
xlabel('Reaction')
ylabel('Catalyst Mass')

... including the plot! (Note the (./) denoting element-wise division.)

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Marina Gonzalez 2019-5-23

Thank you! I have the same problem I had before. I'm doing something wrong because the plot is not right, but at least now I know how to write it down.

Thank you again!

Star Strider 2019-5-23

As always, my pleasure!

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Geoff Hayes 2019-5-23

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编辑：Geoff Hayes 2019-5-23

在 MATLAB Online 中打开

Marina - try

m = zeros(20,1);
k = 1;
for x = 0:0.05:1
    m(k) = F*(k_kin*C*(1-x))/(1+k_ads*C*(1-x))
    k = k + 1;
end

edit to above: repalce == with = in assignment to m

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Geoff Hayes 2019-5-23

在 MATLAB Online 中打开

where is x defined? I think you are missing

x = 0:0.05:1;

just prior to where you define m.

Marina Gonzalez 2019-5-23

Thank you! That has really helped. I think I'm doing something wrong because for a conversion of 0, the mass of the catalyst is way bigger than for the total conversion.