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Assigning a symbolic expression with sprintf command

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Lucas Carvalho
Lucas Carvalho 2017-5-13
评论： Karan Gill 2017-5-14
Hello guys, I'm trying to implement a code where I define a symbolic function and I want to find out its partial derivatives (first and second) also in a symbolic way. The example is below:
prompt = ('\n Type the function: ');
f = sym(input(prompt,'s'));
prompt = ('\n Type the number of independent variables: ');
n1 = (input(prompt));
n2=n1;
for i=1:1:n1
syms(sprintf('x%d', i));
syms(sprintf('df%d', i));
for j=1:1:n2
syms(sprintf('df%d%d', i,j));
end
end
For n=2, I get the following result (all symbolic variables): x1, x2, df1, df2, df11, df12, df21 and df22.
Now I want to assign to each of these variables the proper partial derivative, for example:
df1 = diff(f,x1)
df2 = diff(f,x2)
df11 = diff(df1,x1)
df12 = diff(df1,x2) and so on...
How can I put these diff commands in a loop??
  1 个评论
Karan Gill
Karan Gill 2017-5-14
To confirm, another user is interactively entering the function? That is, you are not defining the function yourself, correct?

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