How can I resolve this error?

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Gianmarco Polizia 2017-9-30

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https://ww2.mathworks.cn/matlabcentral/answers/359134-how-can-i-resolve-this-error

评论： Walter Roberson 2017-10-1

I have written this code:

figure 
name = 'cap_';
vector = {'T0' 'T1' 'T2' 'T3' 'T4' 'T5' 'T6' 'T7' T8' 'T9'};
for i=1:length(vector)
name_1 = strcat(name, vector(i));
name_1 = char(name_1);
plot(x, sscanf(name_1, '%s'), 'y');
hold on
name_1 = [];
end

When I run this code I receive this message error: There is no cap_T1 property on the Line class

If I use:

plot(x, sscanf(name_1, '%s'))  I receive this other message: Error in color/linetype argument

Help me please.

Thanks

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Gianmarco Polizia 2017-9-30

编辑：Gianmarco Polizia 2017-9-30

Hello Walter thanks for attention payed to my question

I would like that the for loop substitutes these code lines:

plot(frequency_1, cap_1)

hold on

plot(frequency_2, cap_2)

plot(frequency_10, cap_10)

Walter Roberson 2017-9-30

... Don't do that!

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回答（1 个）

Walter Roberson 2017-9-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/359134-how-can-i-resolve-this-error#answer_283797

http://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

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Gianmarco Polizia 2017-10-1

@Jan I don't understand the difference between do not create the set of variables at all and store them in an array directly.

In the first case, how is the code? And how is the code in the second case?

Thanks

Walter Roberson 2017-10-1

在 MATLAB Online 中打开

It is better to avoid creating numbered variables and to create indexed variables instead. But if you do for some reason have numbered variables then instead of creating variable names at run-time, it is better to take the one-time hit of putting the variables together into an array and after that index the array.

frequencies = {frequency_1, frequency_2, frequency_3, frequency_4, frequency_5, frequency_6, frequency_7, frequency_8, frequency_9, frequency_10};
caps = {cap_1, cap_2, cap_3, cap_4, cap_5, cap_6, cap_7, cap_8, cap_9, cap_10};
names = cellstr( num2str((1:10).', 'line #%d') );
for K = 1 : length(frequencies)
  plot(frequencies{K}, caps{K});
  hold on
end
legend(names);