# How can I plot an order which is a string variable?

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Aurea94 2017 年 2 月 10 日

Due to my code I have a variable which contains the orders I need to plot: S is a structure of 1x5 struct of 2 fields(Ftime and Ftrans_error)
text = S(1).Ftime,S(1).Ftrans_error,S(2).Ftime,S(2).Ftrans_error,S(3).Ftime,S(3).Ftrans_error
'text' is a string type. I need to make this variable because the size of 'text' changes with the number of variables the structure S contains.
If I do plot(text) I get the following error : Error using plot. Invalid first data argument.
If I write directly
plot(S(1).Ftime,S(1).Ftrans_error,S(2).Ftime,S(2).Ftrans_error,S(3).Ftime,S(3).Ftrans_error) it works properly.
I think the problem is that when I create the variable 'text' it considers I want to plot a string.
So how can I make this 'text' variable an order which plot can execute? I would really apreciate your help. If you need further information to understand the problem please tell me.
Thank you very much in advance!
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Stephen 2017 年 2 月 10 日
@Aurea94: somewhere you have some numeric data. Hopefully not in lots of separate variables (read the link to know why that would be a really bad idea). If you have sensibly kept your numeric data in a structure then you can simply access the fields (and your numeric data) from that structure using those strings:

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### 回答 (1 件)

Walter Roberson 2017 年 2 月 10 日
Please do not name a variable "text" as that interferes with using the key graphics routine text().
What you should be doing is putting your values into a cell array, and then doing cell expansion.
thisorder = {S(1).Ftime,S(1).Ftrans_error, S(2).Ftime, S(2).Ftrans_error, S(3).Ftime,S(3).Ftrans_error};
plot(thisorder{:});
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Aurea94 2017 年 2 月 10 日
Thank you Walter. In fact my variable is named 'text_plot' but I didn't write it to shorten my text. It wasn't a good idea, sorry! I tried what you propose. But I get the same error mentioned before.

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