Use a character variable for a title in a plot function

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balsip 2017-1-16

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评论： Image Analyst 2017-1-16

采纳的回答： Image Analyst

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Hello, I would like to use a pre-defined variable within the title of a plot function. The code that doesn't work is:

Site = char('LabX');

Then within the function itself:

title([Site ', MeanRespValues']);

This returns the error:

Undefined function or variable 'Site'.
Error in plotFunction (line 28)
title([Site ', MeanRespValues']);

Ideally, in the function's prompt it could ask for a site name to be entered, rather than creating a variable.

I'm looking to return a plot with the title "LabX, MeanRespValues".

I appreciate any help you can throw my way.

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Answer 1

Image Analyst 2017-1-16

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编辑：Image Analyst 2017-1-16

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First, make sure Site is in scope - that is, it's visible in the same function where you're going to call title(). It sounds like it's not. Use inputdlg() if you want to ask the user for it but again, do this in the same function where you call title().

Then, once Site is in scope, use sprintf() to create a character string that you can pass to plot():

caption = sprintf('%s, MeanRespValues', Site);
title(caption, 'FontSize', 25, 'FontWeight', 'bold', 'Color', 'b');

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balsip 2017-1-16

Image Analyst,

Thanks for your input. However, I was hoping to define Site without having to open up the function with title().

Is this possible?

Image Analyst 2017-1-16

Yes, it's possible. If Site is defined in some other function, it will be local to that function and not seen by other functions, but there are ways to get it over to the function you need it in. See the FAQ for a variety of different ways. http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

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Answer 2

John BG 2017-1-16

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编辑：John BG 2017-1-16

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Balsip

assuming LabX is type double, uint, ..

use

Site=num2str(LabX)

no need for '' around the variable LabX

the reason is that the function char() doesn't cast the type you want, it produces the character that according to ASCII table has for numeric value 3.

if you find these lines useful would you please mark my answer as Accepted Answer?

To any other reader, if you find this answer of any help please click on the thumbs-up vote link,

thanks in advance for time and attention

John BG

<mailto:jgb2012@sky.com jgb2012@sky.com>

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balsip 2017-1-16

Thanks, John. However, as with Image Analyst's answer below, I was hoping to define the Site variable outside of the function(), so that I don't have to edit the function script itself each time I want to change the plot's title as it is output from the plot function.

Any ideas here?