Error using plot vectors must be the same length матлаб

Error using plot Matlab Решение и ответ на вопрос 1468057

newbie99

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04.06.2015, 08:51. Показов 4721. Ответов 3

Метки нет (Все метки)

были различные ошибки, но смог их исправить, но с этой встал в ступор и не могу понять как быть

Matlab M 
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 u = 1.25:0.4:3.25;
y = ((abs(x.*x-2.5)).^(1/4))+((log10(x.*x)).^(1/3));
plot(u,y);

Error using plot
Vectors must be the same length.
если разбивать функцию на части, то ошибка не пропадает, значит надо изменить формат записи функции?

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Programming

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04.06.2015, 09:09

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Лучший ответ Сообщение было отмечено newbie99 как решение

Решение

В строке 2 переменная x, она во фрагменте не задана.
Усли х это u, то график строится даже с очень мелким шагом.
В точке х=0 функция имеет особую точку, т.к log10(0)= -бесконечности
А в диапазоне -1<x<1 y комплексное.
Но Вашей ошибки не получилось.



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newbie99

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04.06.2015, 09:28

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спасибо, подтолкнули в нужную сторону, исправил и заработало

Добавлено через 4 минуты
с plot работает нормально но с fplot стал писать Too many input arguments.

Matlab M 
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>> f=@(x)((abs(x.*x-2.5)).^(1/4))+((log10(x.*x)).^(1/3));
fplot(f,[0,20],[],[],'-',1.84);
hold on
fplot(f,[0,20],[],[],'~',2.71);
fplot(f,[0,20],[],[],'::',3.81);
fplot(f,[0,20],[],[],':',4.56);
fplot(f,[0,20],[],[],'--',5.62);

не одно, так другое т_т



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04.06.2015, 11:31

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Разберись с параметрами fplot, что там за пустые скобки?



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plot Vectors must be the same lengths

Here is my code

I want to have a figure that the X label is i, the Y label is v and we can see change of V in different Temperature (T). but I face the error that «plot Vectors must be the same lengths.»

How can I fix this error?

2 Answers 2

Check dimension of your x, y vector by using size(i) size(V) . i should be a vector and the size should be [1 Len] or [Len 1]. Make sure the size of V is [Len, xxx] or [xxx, Len] too, so they are in the same length and you can plot it. Also, make sure i, and V have the same length ‘Len’ in the same dimension, otherwise you can use dot quotation operator, V.’ , to get the transpose.

As Steven mentioned, you have a dimensional mismatch. Getting more familiar with a couple of the Matlab array operators (: and .) explained in the code can shorten and clarify the code.

Housekeeping before we get started:

Declare all your variables:

use T as a 1×4 and do that stuff first all of these will be 1×4 afterwards T=333:10:363; Notice the use of the dot operator to do pointwise operations

Now let’s do all the parts that involve i. Let’s not start at i=0 because that gives Nan/Inf results i=0.01:0.01:1;

If you wanted to, you could do this with section using matrix multiplication. It’s implemented here with a for loop because that is easier to follow.

In the V=(idx,:) line we are taking the 101×1 vector and shoving it into the idx row of V using the colon operator.

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,ixOrder]=sort(Radius(index_liq)); % get the sorted order of radius values

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