Why won't anything plot? 6 errors in 3 lines of code.

Question

Josh Crunk 2019-2-6

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回答： John-Paul Ayrton 2022-12-7

I'm working on a larger project and it wouldn't plot and gave me a bunch of errors about things that weren't even a part of my code. I tried a simple code to see if it wiuld plot, but I'm getting the same errors. I've closed and reloaded MatLab and it continues to error.

x = [1 2 3 4 5];
y = [1 2 3 4 5];
plot(x,y)

Above is the code to plot and below are the errors.

>> Untitled
Undefined function 'claNotify' for input arguments of type 'matlab.graphics.axis.Axes'.
Error in cla (line 42)
    claNotify(ax,extra{:});
Error in newplot>ObserveAxesNextPlot (line 152)
            cla(ax, 'reset', hsave);
Error in newplot (line 93)
    ax = ObserveAxesNextPlot(ax, hsave);
Error in matlab.graphics.internal.newplotwrapper (line 12)
axReturn = newplot(varargin{:});
Error in Untitled (line 3)
plot(x,y)

I'm running MATLAB R2018b - academic use. Thanks for any suggestions.

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Josh Crunk 2019-2-7

I have unistalled and reinstalled this version of MatLab on my computer and the problem continues.

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Answer 1

Star Strider 2019-2-7

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https://ww2.mathworks.cn/matlabcentral/answers/443598-why-won-t-anything-plot-6-errors-in-3-lines-of-code#answer_359853

It’s always worth running these commands:

restoredefaultpath 
rehash toolboxcache 

from your Command Window (or a script) before you click on the Contact Us link in the upper right corner of this page to ask MathWorks for Technical support. (If you need to do that, run the ver command first.)

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Star Strider 2019-2-7

Use the Contact Us link to request Technical Support from MathWorks.

Rik 2019-8-1

Comment posted as flag by Andreas Junge:

I had the same message, after the commands Problem was solved!

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Answer 2

Matt Gaidica 2019-2-7

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Try:

open plot

See if plot is a variable or if the project has redefined it.

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Josh Crunk 2019-2-7

I tried that and got

%PLOT   Linear plot. 
%   PLOT(X,Y) plots vector Y versus vector X. If X or Y is a matrix,
%   then the vector is plotted versus the rows or columns of the matrix,
%   whichever line up.  If X is a scalar and Y is a vector, disconnected
%   line objects are created and plotted as discrete points vertically at
%   X.
%
%   PLOT(Y) plots the columns of Y versus their index.
%   If Y is complex, PLOT(Y) is equivalent to PLOT(real(Y),imag(Y)).
%   In all other uses of PLOT, the imaginary part is ignored.
%
%   Various line types, plot symbols and colors may be obtained with
%   PLOT(X,Y,S) where S is a character string made from one element
%   from any or all the following 3 columns:
%
%          b     blue          .     point              -     solid
%          g     green         o     circle             :     dotted
%          r     red           x     x-mark             -.    dashdot 
%          c     cyan          +     plus               --    dashed   
%          m     magenta       *     star             (none)  no line
%          y     yellow        s     square
%          k     black         d     diamond
%          w     white         v     triangle (down)
%                              ^     triangle (up)
%                              <     triangle (left)
%                              >     triangle (right)
%                              p     pentagram
%                              h     hexagram
%                         
%   For example, PLOT(X,Y,'c+:') plots a cyan dotted line with a plus 
%   at each data point; PLOT(X,Y,'bd') plots blue diamond at each data 
%   point but does not draw any line.
%
%   PLOT(X1,Y1,S1,X2,Y2,S2,X3,Y3,S3,...) combines the plots defined by
%   the (X,Y,S) triples, where the X's and Y's are vectors or matrices 
%   and the S's are strings.  
%
%   For example, PLOT(X,Y,'y-',X,Y,'go') plots the data twice, with a
%   solid yellow line interpolating green circles at the data points.
%
%   The PLOT command, if no color is specified, makes automatic use of
%   the colors specified by the axes ColorOrder property.  By default,
%   PLOT cycles through the colors in the ColorOrder property.  For
%   monochrome systems, PLOT cycles over the axes LineStyleOrder property.
%
%   Note that RGB colors in the ColorOrder property may differ from
%   similarly-named colors in the (X,Y,S) triples.  For example, the 
%   second axes ColorOrder property is medium green with RGB [0 .5 0],
%   while PLOT(X,Y,'g') plots a green line with RGB [0 1 0].
%
%   If you do not specify a marker type, PLOT uses no marker. 
%   If you do not specify a line style, PLOT uses a solid line.
%
%   PLOT(AX,...) plots into the axes with handle AX.
%
%   PLOT returns a column vector of handles to lineseries objects, one
%   handle per plotted line. 
%
%   The X,Y pairs, or X,Y,S triples, can be followed by 
%   parameter/value pairs to specify additional properties 
%   of the lines. For example, PLOT(X,Y,'LineWidth',2,'Color',[.6 0 0]) 
%   will create a plot with a dark red line width of 2 points.
%
%   Example
%      x = -pi:pi/10:pi;
%      y = tan(sin(x)) - sin(tan(x));
%      plot(x,y,'--rs','LineWidth',2,...
%                      'MarkerEdgeColor','k',...
%                      'MarkerFaceColor','g',...
%                      'MarkerSize',10)
%
%   See also PLOTTOOLS, SEMILOGX, SEMILOGY, LOGLOG, PLOTYY, PLOT3, GRID,
%   TITLE, XLABEL, YLABEL, AXIS, AXES, HOLD, LEGEND, SUBPLOT, SCATTER.
%   If the NextPlot axes property is "replace" (HOLD is off), PLOT resets 
%   all axes properties, except Position, to their default values,
%   deletes all axes children (line, patch, text, surface, and
%   image objects), and sets the View property to [0 90].
%   Copyright 1984-2009 The MathWorks, Inc. 
%   Built-in function.

bo xiang 2020-10-26

here is me wondering why plot(x1,y1,'k--r+') is an error...

Rik 2020-10-26

@bo xiang, What color do you want your plot to be? Black or red?

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Answer 3

Veda Upadhye 2019-2-19

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One possible explanation of this issue could be shadowing of 'plot' or built-in MATLAB functions that are internally used by 'plot'. You can verify this using the below example (for 'plot' and other functions in your error stack trace):

which -all plot

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Answer 4

Abdallah Ghazi Faisal Zaid Alkilani 2020-3-28

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I had a similar issue and I think the culprit is a function called newplot.m.

newplot.m function has subfunctions inside that were not terminated with 'end'.

I added an 'end' statement for each function inside newplot.m:

function axReturn = newplot(hsave)
function fig = ObserveFigureNextPlot(fig, hsave)
function ax = ObserveAxesNextPlot(ax, hsave)

It has worked so far *fingers crossed*.

You can open the file to edit by typing >> open newplot;

I hope this helps.

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Rik 2020-3-28

I would be very careful with recommending people to edit internal Matlab functions. Those should not be edited, because you have no way of knowing what functions rely on the function behaving the exact way it does.

Apart from that: a function is allowed not to terminate with an end keyword, as long as non of the functions do so. This used to be the default; Matlab would even warn you about the unnecessary closing end statements.

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Answer 5

Nurye Hassen 2020-8-6

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Optionally, you can enter the variables X and Y on the command window, then select them from your workspoace then go to "Plots" tab on the top next to "Home" to choose the plot you need. That may help.

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Answer 6

Nurye Hassen 2020-8-6

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编辑：Nurye Hassen 2020-8-6

To solve the problem once and for all do the following on command window.

open plot

then right click on the plot file on the editor and select "show in folder" and check the path. For your case it should be where you installed the MATLAB like...

C:\Program Files\MATLAB\R2017b\toolbox\matlab\graph2d

if you got it in Documents or other folder delete all the files or ZIP and keep it far away.

Let me know if didn't solve it.