# fix certain parameters during curve fit python lambda

```def func(x,a,b):
return a*x*x + b

for b in xrange(10):
popt,pcov = curve_fit(lambda x, a: func(x, a, b), x1, x2)```

Here is what the above code is Doing:
1. It’s defining a function func(x,a,b) that takes two parameters, a and b.
2. It’s looping over a range of values for b.
3. For each value of b, it’s calling curve_fit() to fit the function func(x,a,b) to the data.

The problem is that curve_fit() is not being given a function that takes only one parameter.
It’s being given a function that takes two parameters.

The solution is to use a lambda function to create a function that takes only one parameter.
The lambda function is a function that takes one parameter, a, and returns the function func(x,a,b)
with b set to a particular value.

The lambda function is defined as:
lambda x, a: func(x, a, b)

The lambda function is called as:
lambda x, a: func(x, a, b)(x1, x2)

The lambda function is called with two parameters, x1 and x2.
The first parameter, x1, is passed to the function func(x,a,b) as x.
The second parameter, x2, is passed to the function func(x,a,b) as a.
The value of b is set to a particular value.

The lambda function returns the function func(x,a,b) with b set to a particular value.

The lambda function is called by curve_fit() as:
lambda x, a: func(x, a, b)(x1, x2)

The lambda function is called with two parameters, x1 and x2.
The first parameter, x1, is passed to the function func(x,a,b) as x.
The second parameter, x2, is passed to the function func(x,a,b) as a.
The value of b is set to a particular value.

The lambda function returns the function func(x,a,b) with b set to a particular value.

The lambda function is called by curve_fit() as:
lambda x, a: func(x, a, b)(x1, x2)

The lambda function is called with two parameters, x1 and x2.
The first parameter, x1, is passed to the function func(x,a,b) as x.
The second parameter, x2, is passed to the function func(x,a,b) as a.
The value of b is set to a particular value.

The lambda function returns the function func(x,a,b) with b set to a particular value.

The lambda function is called by curve_fit() as:
lambda x, a: func(x, a, b)(x1, x2)

The lambda function is called with two parameters, x1 and x2.
The first parameter, x1, is passed to the function func(x,a,b) as x.
The second parameter, x2, is passed to the function func(x,a,b) as a.
The value of b is set to a particular value.

The lambda function returns the function func(x,a,b) with b set to a particular value.

The lambda function is called by curve_fit() as:
lambda x, a: func(x, a, b)(x1, x2)

The lambda function is called with two parameters, x1 and x2.
The first parameter, x1, is passed to the function func(x,a,b) as x.
The second parameter, x2,