coordinate data in the text command

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hans 2021-12-16

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评论： hans 2021-12-16

Is it possible to somehow put both, x- and y-coordinate, with a single variable of two fields into the location fields of the text-command?

instead of :

loc = [0.5,0.5];
figure; text(loc(1),loc(2),'a')

something like

Is it possible to somehow put both, x- and y-coordinate, into the location fields of the text-command?

instead of :

loc = [0.5;0.5];
figure; text(loc,'a')

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Rik 2021-12-16

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https://ww2.mathworks.cn/matlabcentral/answers/1612285-coordinate-data-in-the-text-command#answer_856370

You have two options that I'm aware of:

Write a wrapper function that will split your vector as approriate.
Use a comma separated list: loc=[0.5;0.5];loc=num2cell(loc);text(loc{:},'a')

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Rik 2021-12-16

在 MATLAB Online 中打开

{:} will generate a comma separated list. That means these two lines are equivalent:

%loc{:}
%loc{1},loc{2}

That is why this syntax works. Your single input isn't actually a single input as far as the text function is concerned.

The syntax Walter proposed works because it uses the Name,Value syntax that most objects (and many functions) in Matlab allow. You specify the 'Postition' parameter as a vector, just like the documentation describes. Since you're skipping the normal syntax options (the first two you see below), you need to specify the 'String' parameter as well (which, confusingly, doesn't need to contain a string, but may contain a char array instead, which is because the parameter name predates the data type).

help text
 TEXT Add text descriptions to data points
    TEXT(x,y,str) adds a text description to one or more data points in the
    current axes using the text specified by str. To add text to one point,
    specify x and y as scalars in data units. To add text to multiple
    points, specify x and y as vectors with equal length.
 
    TEXT(x,y,z,str) positions the text in 3-D coordinates.
    
    TEXT(...,Name,Value) specifies text properties using one or more
    Name,Value pair arguments. For example, 'FontSize',14 sets the font
    size to 14 points. You can specify text properties with any of the
    input argument combinations in the previous syntaxes. If you specify
    the Position and String properties as Name,Value pairs, then you do not
    need to specify the x, y, z, and str inputs.
 
    TEXT(container,...) creates the text in the axes, group, or transform
    specified by container, instead of in the current axes.
 
    T = TEXT(...) returns one or more text objects. Use T to modify
    properties of the text objects after they are created. For a list of
    properties and descriptions, see Text Properties. You can specify an
    output with any of the previous syntaxes.
 
    Execute GET(T), where T is a text object, to see a list of text object
    properties and their current values.
    Execute SET(T) to see a list of text object properties and legal
    property values.
 
    See also XLABEL, YLABEL, ZLABEL, TITLE, GTEXT, LINE, PATCH.

    Documentation for text
       doc text

    Folders named text

       io/text

hans 2021-12-16

编辑：hans 2021-12-16

"Your usage of the terms "writing and reading" is not clear to me. "

I used writing for may be a better word might be "assigning a value to a variable" e.g. a=1
I used reading for replacing the "value of a variable" by the "variable"

"No, a comma separated list is a list of variables separated by commas."

That is obviously correct. But I try to talk about the field of application of this list.

So may be it is more suitable to modify my statement by ""The "comma separated" is a special communication form for assigning values to arrays and using these arrays to replace a comma separated list of arguments, which was expected in a command"

My point is, that the application of a comma separated list is only in the communication i.e. assigning and use of arrays

hans 2021-12-16

May be to tell it shorter:

It seems to me comma separated lists have their dominating area of application assigning values to arrays and to fill argument lists of commands/functions

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