what is this error "error updating text"
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jacob booth
on 28 Jul 2021
Commented: jacob booth
on 28 Jul 2021
i keep gettin an error i have not seen before
"Warning error updating text string scalar or character bector must have valid interpreter syntax"
below is the code
x=(1:15); % x
y=[0.35 0.4 0.52 0.58 0.46 0.74 0.68 0.82 1.03 1.17 1.81 2.01 2.63 3.29 4]; % y
P=polyfit(x,log(y),1);
A=exp(P(2))
B=(P(1))
y_fit=a*exp(b*x);
figure
plot(x,y,'r*')
xlabel('x')
ylabel('y and y__fit')
grid on
hold on
plot(x,y_fit,'-b')
legend('Original data (y)','Fitted data (y__fit)')
1 Comment
Fangjun Jiang
on 28 Jul 2021
Add "clear all" as the first line of your code, run it again, debug it and paste the error that you couldn't resolve.
Accepted Answer
Cris LaPierre
on 28 Jul 2021
By default, labels and legends (among other things) apply a tex interpreter to their text. The '_' is used to indicate a subscript.
In your text, you use a double underscore: 'y__fit'. The error is telling you that MATLAB does not know how to interpret this. If you do not want it to do anything, change your code to set the corresponding interpreters to 'none'.
x=(1:15); % x
y=[0.35 0.4 0.52 0.58 0.46 0.74 0.68 0.82 1.03 1.17 1.81 2.01 2.63 3.29 4]; % y
P=polyfit(x,log(y),1);
a=exp(P(2))
b=(P(1))
y_fit=a*exp(b*x);
figure
plot(x,y,'r*')
xlabel('x')
ylabel('y and y__fit','Interpreter',"none")
grid on
hold on
plot(x,y_fit,'-b')
legend('Original data (y)','Fitted data (y__fit)','Interpreter',"none")
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