Too many non-property/value arguments error occurred when applying a text box to a figure

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Zeynab Mousavikhamene
评论： Walter Roberson 2019-9-6
Here is the line:
text(2,3,'\bf fontname{times} infty','FontSize',12,'center')

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Walter Roberson
Walter Roberson 2019-9-6
'center' is not an option by itself. You want either 'HorizontalAlignment', 'center' or 'VerticalAlignment', 'center'
Also you appear to be missing \ before fontname and before infty: '\bf \fontname{times} \infty'
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Zeynab Mousavikhamene
Zeynab Mousavikhamene 2019-9-6
Thanks for your note. what is the role of \?
I uesed 'HorizontalAlignment', 'center' but the inf is not in the middle. For example I need inf sign to be exactly in the middle of x=2 (highlighted in the picture).Capture.JPG
Walter Roberson
Walter Roberson 2019-9-6
text(2, 3, '\bf\fontname{times}\infty','horizontalalignment', 'center', 'fontsize', 12)
That is, those two spaces you had in your control string were being output as spaces.
\ signals to the (default) tex interpreter that the next few characters are a command or special character . For example 'beta \beta' would output

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