Does line() function works in matlab R2015b ?

i had run code that used line() function. and then i got error in line() function.

Error using line

vectors must be the same length

Error in file_name (line 45)

line(h, [thisX, thisX], ylim(h), 'Color', 'r');

h is subplot(4, 12, 1:12).

both of thisX variables off course had the same length.

So. does MATLAB R2015B support line() function ? or was i just wrong while placing the arguments ?

Answer 1

[Walter Roberson]

ylim(h) is going to be a row vector of length 2. If your thisX is not scalar then the X values you construct would not be the same length .

you cannot use line() to draw a series of vertical lines. line() can only create one line object per call. plot() can create multiple line objects per call.

[Jan]

@Walter: line is able to create multiple lines with one call by providing matrices as input - exactly as plot:

axes;
line([1,2;3,4], [1,3;2,4])

[Walter Roberson]

Hmmm, I'm sure that didn't work at some point in the past...

[Bachtiar Muhammad Lubis]

thisX is scalar numeric sir that has float data type.

[Walter Roberson]

Okay, the problem is that in R2015b, it was not yet permitted to pass an axes as the first parameter. See https://www.mathworks.com/help/releases/R2015b/matlab/ref/line.html

The cure is to use the 'Parent' parameter:

line([thisX, thisX], ylim(h1), 'Parent', h1)

[Bachtiar Muhammad Lubis]

thank you very much sir @Walter Roberson ! brilliant

Answer 2

[Star Strider]

‘So. does MATLAB R2015B support line() function ?’

The line (link) function was ‘Introduced before R2006a’ according to the documentation, so it should.

‘both of thisX variables off course had the same length.’

True. However you horizontally concatenated two of them.

‘or was i just wrong while placing the arguments ?’

I would agree.

If we see your entire code, we would be able to provide more help.

[Bachtiar Muhammad Lubis]

these are my files sir. sorry for late respone

Answer 3

[Jan]

"h is subplot(4, 12, 1:12)" - this is not clear. Is h a scalar or a vector?

The message is clear: [thisX, thisX] and ylim(h) do not have matching sizes. So use the debugger to examine the problem:

dbstop if error

Type this in the command window and run the code again. When Matlab stops at the error, check the sizes:

size([thisX, thisX])
size(ylim(h))

[Walter Roberson]

subplot(4, 12, 1:12)

subplot can be passed a vector of values for the third parameter. The effect is to create an axes that spans the referenced positions (which must form a rectangular sub-block)

[Walter Roberson]

Watch out for thisX being row vector vs column vector. With column vector you might get away with it; with row vector you will not, not unless thisX is scalar.

[Bachtiar Muhammad Lubis]

@ Jan : this is the output of h sir:

the size is 1x1.

And i just tried your solution sir. the error still showed up. And then output of both size([thisX, thisX]) and size(ylim(h)) are 1x2.