Plot data for unique temperatures imported from text file

Question

Cate may 2020-10-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/618568-plot-data-for-unique-temperatures-imported-from-text-file

评论： Cate may 2020-10-19

Hello,

I would like to plot the reaction against concentration on a 3 by 1 subplot for each unique temperature in the imported text data file. I think I need to put it in a loop but I'm not sure how to get it to plot.

Any help is appreciated, the code I have so far is below and text file ('reactions.txt') is attached.

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Rik 2020-10-19

You're forgetting several things:

You are plotting the entire c and r vectors, not just the parts that belong to a specific temperature.
You use hold on before creating the first plot in the subplot axes.
The a variable describes positions in your temp array, not its values.

Cate may 2020-10-19

编辑：Rik 2020-10-19

在 MATLAB Online 中打开

mathworkds.m

hello thanks for the feedback, I've attached the actual code so it can run.

So how can I plot just the c and r vectors for the specific temperatures?

and how can I code the a variable so it describes the temp values and not its positions.

Thanks

%% code starts here
r_data = importdata('reactions.txt');
%reaction_data = r_data.data;
%fid=fopen('reactions.txt');
t = reaction_data(:,1); %temperatures in vector
c = reaction_data(:,2); % concentration
r = reaction_data(:,3); % reaction rate
temp = unique(t);
for a = 1:length(temp)
    if a == 323
        hold on
        subplot (3,1,1)
        plot(c,r)
    elseif a==333
        hold on
        subplot(3,1,2)
        plot(c,r)
    elseif a ==343
        hold on
        subplot(3,1,3)
        plot(c,r)
    end 
end

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Answer 1

Rik 2020-10-19

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/618568-plot-data-for-unique-temperatures-imported-from-text-file#answer_517788

在 MATLAB Online 中打开

%% code starts here
r_data = importdata('reactions.txt');
%reaction_data = r_data.data;
%fid=fopen('reactions.txt');
t = reaction_data(:,1); %temperatures in vector
c = reaction_data(:,2); % concentration
r = reaction_data(:,3); % reaction rate
temp = unique(t);
for a = 1:length(temp)
    L= t==temp(a) ;
    if temp(a)==323
        subplot (3,1,1)
        plot(c(L),r(L))
    elseif temp(a)==333
        subplot(3,1,2)
        plot(c(L),r(L))
    elseif temp(a)==343
        subplot(3,1,3)
        plot(c(L),r(L))
    else
        warning('temperature of %.0f not plotted',temp(a))
    end 
end