Print text on a graph with values, retaining superscripts?

2013 11 14
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更新时间：2013 11 14
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I have written code (nested for loops) to solve for the constants in the Gompertz Formula. This curve is fit to the data I had gathered. Once the iteration is complete I have values for A, B, and C (the constants in the equation). I want to graph the original data, the fitted curve, and then write the equation on the plot of the fitted curve. The following is the code I used to write the text:
text(Xt,Yt,['Y(t)=',num2str(A),'e^',num2str(B),'e^',num2str(C),'t'])
This works, however when it prints on the graph, the formatting is not ideal. Basically, both B and C are always negative numbers. Immediately following each e, the negative sign is superscript, but everything following it is normal. I found some text tutorials that indicated that placing curly brackets around the text that you want to be superscript should fix this, i.e.
text(Xt,Yt,['Y(t)=',num2str(A),'e^',{num2str(B),'e^',{num2str(C),'t'}}])
but when I run that code I get the error message
Error using text
Cell array of strings may only contain string and numeric matrices
Is there a way to insert the calculated constants in the equation AND retain the equation formatting? Any help would be greatly appreciated... Thanks!

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Walter Roberson
Walter Roberson 2013-11-14

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text(Xt,Yt,['Y(t)=',num2str(A),'e^{',num2str(B),'}e^{',num2str(C),'}t'])

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Matt
Matt 2013-11-14
Thanks so much! looks like I was putting the curly brackets in the wrong place. I modified your answer a bit:
text(Xt,Yt,['Y(t)=',num2str(A),'e^{',num2str(B),'e^{',num2str(C),'t}}'])
to get the nested exponents.

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Azzi Abdelmalek
Azzi Abdelmalek 2013-11-14

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text(Xt,Yt,['Y(t)=',num2str(A),'e^',num2str(B),'e^',num2str(C),'t'])

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Matt
Matt 2013-11-14
That is the code that I was originally using, and it does print on the graph, however it doesn't retain the superscript formatting that generally follows 'e^' when using the text function. I suspect this is due to the way that the 'e^' function interacts with the num2str function. I am just trying to find out if the string from the num2str function can remain as a superscript after the 'e^'. Thanks!
Azzi Abdelmalek
Azzi Abdelmalek 2013-11-14
Look at this example
A=12;
B=23;
C=15;
plot(1:20);
Bt=num2str(B)
Bt=[repmat('^',1,numel(Bt));Bt]
Ct=num2str(C);
Ct=[repmat('^',1,numel(Ct));Ct]
text(5,5,['Y(t)=',num2str(A),'e',Bt(:)','e',Ct(:)','t'])

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