Modular•8mo ago

Segmentation Fault, Got Object when returning a Float

mojo test.🔥 /mnt/d/Projects/QUk.YW5k.TUw/Cartoonify/test.🔥:18:32: error: cannot implicitly convert 'object' value to 'FloatLiteral' in assignment pi = monte_carlo_simulation(10) ~~~~^~ mojo: error: failed to parse the provided Mojo

7 Replies

꧁✧Ɲ_44✧꧂•8mo ago

from python import Python

def monte_carlo_simulation(n: Int):
    let random = Python.import_module("random")
    var count = 0
    for i in range(n):
        let x = random.random()
        let y = random.random()
        let sum = x * x + y * y
        if sum <= 1:
            count += 1
    return 4 * (count / n)

fn main() raises:
    let py = Python.import_module("builtins") 
    let n = int(py.input("Enter the number of iterations: "))
    var pi = 0.0
    pi = monte_carlo_simulation(10)
    print(pi)

    return None

from python import Python

def monte_carlo_simulation(n: Int):
    let random = Python.import_module("random")
    var count = 0
    for i in range(n):
        let x = random.random()
        let y = random.random()
        let sum = x * x + y * y
        if sum <= 1:
            count += 1
    return 4 * (count / n)

fn main() raises:
    let py = Python.import_module("builtins") 
    let n = int(py.input("Enter the number of iterations: "))
    var pi = 0.0
    pi = monte_carlo_simulation(10)
    print(pi)

    return None

This resulted in

mojo test.🔥 
/mnt/d/Projects/QUk.YW5k.TUw/Cartoonify/test.🔥:18:32: error: cannot implicitly convert 'object' value to 'FloatLiteral' in assignment
    pi = monte_carlo_simulation(10)
         ~~~~~~~~~~~~~~~~~~~~~~^~~~
mojo: error: failed to parse the provided Mojo

mojo test.🔥 
/mnt/d/Projects/QUk.YW5k.TUw/Cartoonify/test.🔥:18:32: error: cannot implicitly convert 'object' value to 'FloatLiteral' in assignment
    pi = monte_carlo_simulation(10)
         ~~~~~~~~~~~~~~~~~~~~~~^~~~
mojo: error: failed to parse the provided Mojo

I am new to mojo, started yesterday so i dont know much

Michael K•8mo ago

You hav ea type mismatch when assigning pi = monte_carlo_simulation(10). When you initially set pi to 0, mojo will infer the type as FloatLiteral and expect the variable to always hold that type. The type returned from monte_carlo_simulation is an object. Anything returned from a python function is an object I believe. The fix is just to use let pi = monte_carlo_simulation(10) and remove the var pi line. That way it is inferring the correct type for your return value.

꧁✧Ɲ_44✧꧂•8mo ago

Ok but the segmentation fault?

[1980:1980:20240121,114858.370016:ERROR file_io_posix.cc:144] open /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq: No such file or directory (2)
[1980:1980:20240121,114858.370119:ERROR file_io_posix.cc:144] open /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq: No such file or directory (2)
Please submit a bug report to https://github.com/modularml/mojo/issues and include the crash backtrace along with all the relevant source codes.
Stack dump:
0.      Program arguments: mojo test.\360\237\224\245
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  mojo            0x0000556fa6fb7ee7
1  mojo            0x0000556fa6fb5abe
2  mojo            0x0000556fa6fb85bf
3  libpthread.so.0 0x00007f2c8ec10420
[1]    1978 segmentation fault  mojo test.🔥

[1980:1980:20240121,114858.370016:ERROR file_io_posix.cc:144] open /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq: No such file or directory (2)
[1980:1980:20240121,114858.370119:ERROR file_io_posix.cc:144] open /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq: No such file or directory (2)
Please submit a bug report to https://github.com/modularml/mojo/issues and include the crash backtrace along with all the relevant source codes.
Stack dump:
0.      Program arguments: mojo test.\360\237\224\245
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  mojo            0x0000556fa6fb7ee7
1  mojo            0x0000556fa6fb5abe
2  mojo            0x0000556fa6fb85bf
3  libpthread.so.0 0x00007f2c8ec10420
[1]    1978 segmentation fault  mojo test.🔥

Oh wait a new one I used to build it previously Now i just ran it instead

Michael K•8mo ago

I think the fix I provided is all that is needed for the code you provided. It runs on my machine with output of 3.20 after asking me to input a number of iterations. So if problems persist for you, I would try reinstalling Mojo.

꧁✧Ɲ_44✧꧂•8mo ago

Oh I am using windows, wsl Maybe thats why?

Michael K•8mo ago

Maybe. I am on a Macbook. But I think Windows via WSL should work. Are you using WSL 1 or WSL 2? Their is a comment in the docs to prefer 2.

GitHub

mojo/docs/roadmap.md at 700bc916fb6db60a5c1ad565c47c9d2dc49abd02 · ...

The Mojo Programming Language. Contribute to modularml/mojo development by creating an account on GitHub.

꧁✧Ɲ_44✧꧂•8mo ago

Ws; 2

Gaming

Programming

Segmentation Fault, Got Object when returning a Float