I have a for loop nested within my while loop, what is causing an infinite loop within my code?












0















I'm new to Python and coding in general. I am trying to use a while loop with a nested for loop to calculate the lowest % of salary that can be saved that will reach the savings goal within 36 months. The code also includes functions to apply a semi-annual raise to the salary every 6 months and to apply interest gained to the savings.



When I run my code it results in an infinite loop and I haven't been able to see what is causing it.



total_cost = 1000000

semi_annual_raise = 0.07

down_payment = 0.25*total_cost

starting_salary = float(input("What is your annual salary?: "))

monthly_salary = starting_salary/12.0

r = 0.04

steps = 0

epsilon = 100

low = 0

high = 10000

portion_saved = (high + low)/2.0

current_savings = 0

raise_counter = 0



while abs(current_savings - down_payment) > epsilon:

    current_savings = 0



    for months in range(36):

        current_savings += (current_savings*r/12) + (monthly_salary* 

        (portion_saved/10000))



        if raise_counter == 6:

            monthly_salary += monthly_salary*semi_annual_raise

            raise_counter = 0

        raise_counter += 1



    if current_savings < down_payment:

        low = portion_saved

    else:

        high = portion_saved

    portion_saved = (high + low)/2.0

    steps += 1

    raise_counter = 0

print ("Number of steps =", steps)

print ("Optimal % to save:", portion_saved/10000)





python-3.x for-loop if-statement while-loop bisection







share|improve this question

























  • current_savings goes only up and down_payment does not change? In this case the condition abs(current_savings - down_payment) > epsilon will be True forever.

    – Poolka
    Nov 20 '18 at 6:58













  • @Poolka How do I reset current_savings to 0 for the beginning of each iteration of the while loop?

    – Luke Paloutzian
    Nov 20 '18 at 20:38
















0















I'm new to Python and coding in general. I am trying to use a while loop with a nested for loop to calculate the lowest % of salary that can be saved that will reach the savings goal within 36 months. The code also includes functions to apply a semi-annual raise to the salary every 6 months and to apply interest gained to the savings.



When I run my code it results in an infinite loop and I haven't been able to see what is causing it.



total_cost = 1000000

semi_annual_raise = 0.07

down_payment = 0.25*total_cost

starting_salary = float(input("What is your annual salary?: "))

monthly_salary = starting_salary/12.0

r = 0.04

steps = 0

epsilon = 100

low = 0

high = 10000

portion_saved = (high + low)/2.0

current_savings = 0

raise_counter = 0



while abs(current_savings - down_payment) > epsilon:

    current_savings = 0



    for months in range(36):

        current_savings += (current_savings*r/12) + (monthly_salary* 

        (portion_saved/10000))



        if raise_counter == 6:

            monthly_salary += monthly_salary*semi_annual_raise

            raise_counter = 0

        raise_counter += 1



    if current_savings < down_payment:

        low = portion_saved

    else:

        high = portion_saved

    portion_saved = (high + low)/2.0

    steps += 1

    raise_counter = 0

print ("Number of steps =", steps)

print ("Optimal % to save:", portion_saved/10000)





python-3.x for-loop if-statement while-loop bisection







share|improve this question

























  • current_savings goes only up and down_payment does not change? In this case the condition abs(current_savings - down_payment) > epsilon will be True forever.

    – Poolka
    Nov 20 '18 at 6:58













  • @Poolka How do I reset current_savings to 0 for the beginning of each iteration of the while loop?

    – Luke Paloutzian
    Nov 20 '18 at 20:38














0












0








0








I'm new to Python and coding in general. I am trying to use a while loop with a nested for loop to calculate the lowest % of salary that can be saved that will reach the savings goal within 36 months. The code also includes functions to apply a semi-annual raise to the salary every 6 months and to apply interest gained to the savings.



When I run my code it results in an infinite loop and I haven't been able to see what is causing it.



total_cost = 1000000

semi_annual_raise = 0.07

down_payment = 0.25*total_cost

starting_salary = float(input("What is your annual salary?: "))

monthly_salary = starting_salary/12.0

r = 0.04

steps = 0

epsilon = 100

low = 0

high = 10000

portion_saved = (high + low)/2.0

current_savings = 0

raise_counter = 0



while abs(current_savings - down_payment) > epsilon:

    current_savings = 0



    for months in range(36):

        current_savings += (current_savings*r/12) + (monthly_salary* 

        (portion_saved/10000))



        if raise_counter == 6:

            monthly_salary += monthly_salary*semi_annual_raise

            raise_counter = 0

        raise_counter += 1



    if current_savings < down_payment:

        low = portion_saved

    else:

        high = portion_saved

    portion_saved = (high + low)/2.0

    steps += 1

    raise_counter = 0

print ("Number of steps =", steps)

print ("Optimal % to save:", portion_saved/10000)





python-3.x for-loop if-statement while-loop bisection







share|improve this question
















I'm new to Python and coding in general. I am trying to use a while loop with a nested for loop to calculate the lowest % of salary that can be saved that will reach the savings goal within 36 months. The code also includes functions to apply a semi-annual raise to the salary every 6 months and to apply interest gained to the savings.



When I run my code it results in an infinite loop and I haven't been able to see what is causing it.



total_cost = 1000000

semi_annual_raise = 0.07

down_payment = 0.25*total_cost

starting_salary = float(input("What is your annual salary?: "))

monthly_salary = starting_salary/12.0

r = 0.04

steps = 0

epsilon = 100

low = 0

high = 10000

portion_saved = (high + low)/2.0

current_savings = 0

raise_counter = 0



while abs(current_savings - down_payment) > epsilon:

    current_savings = 0



    for months in range(36):

        current_savings += (current_savings*r/12) + (monthly_salary* 

        (portion_saved/10000))



        if raise_counter == 6:

            monthly_salary += monthly_salary*semi_annual_raise

            raise_counter = 0

        raise_counter += 1



    if current_savings < down_payment:

        low = portion_saved

    else:

        high = portion_saved

    portion_saved = (high + low)/2.0

    steps += 1

    raise_counter = 0

print ("Number of steps =", steps)

print ("Optimal % to save:", portion_saved/10000)





python-3.x for-loop if-statement while-loop bisection




python-3.x for-loop if-statement while-loop bisection






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 20 '18 at 20:53







Luke Paloutzian

















asked Nov 20 '18 at 3:44









Luke PaloutzianLuke Paloutzian

11




11













  • current_savings goes only up and down_payment does not change? In this case the condition abs(current_savings - down_payment) > epsilon will be True forever.

    – Poolka
    Nov 20 '18 at 6:58













  • @Poolka How do I reset current_savings to 0 for the beginning of each iteration of the while loop?

    – Luke Paloutzian
    Nov 20 '18 at 20:38



















  • current_savings goes only up and down_payment does not change? In this case the condition abs(current_savings - down_payment) > epsilon will be True forever.

    – Poolka
    Nov 20 '18 at 6:58













  • @Poolka How do I reset current_savings to 0 for the beginning of each iteration of the while loop?

    – Luke Paloutzian
    Nov 20 '18 at 20:38

















current_savings goes only up and down_payment does not change? In this case the condition abs(current_savings - down_payment) > epsilon will be True forever.

– Poolka
Nov 20 '18 at 6:58







current_savings goes only up and down_payment does not change? In this case the condition abs(current_savings - down_payment) > epsilon will be True forever.

– Poolka
Nov 20 '18 at 6:58















@Poolka How do I reset current_savings to 0 for the beginning of each iteration of the while loop?

– Luke Paloutzian
Nov 20 '18 at 20:38





@Poolka How do I reset current_savings to 0 for the beginning of each iteration of the while loop?

– Luke Paloutzian
Nov 20 '18 at 20:38












1 Answer
1






active

oldest

votes


















0














Why have you used (monthly_salary*portion_saved/10000 ? Since you need to add the portion_saved to the current_savings each month, i would recommend you to use



current_savings+=(current_savings*r/12) + portion_saved



I think you can also simplify the process by finding the % to be saved using the below formula



monthly_salary*(save_percent/100)* 36 = down_payment-epsilon






share|improve this answer























    Your Answer






    StackExchange.ifUsing("editor", function () {
    StackExchange.using("externalEditor", function () {
    StackExchange.using("snippets", function () {
    StackExchange.snippets.init();
    });
    });
    }, "code-snippets");

    StackExchange.ready(function() {
    var channelOptions = {
    tags: "".split(" "),
    id: "1"
    };
    initTagRenderer("".split(" "), "".split(" "), channelOptions);

    StackExchange.using("externalEditor", function() {
    // Have to fire editor after snippets, if snippets enabled
    if (StackExchange.settings.snippets.snippetsEnabled) {
    StackExchange.using("snippets", function() {
    createEditor();
    });
    }
    else {
    createEditor();
    }
    });

    function createEditor() {
    StackExchange.prepareEditor({
    heartbeatType: 'answer',
    autoActivateHeartbeat: false,
    convertImagesToLinks: true,
    noModals: true,
    showLowRepImageUploadWarning: true,
    reputationToPostImages: 10,
    bindNavPrevention: true,
    postfix: "",
    imageUploader: {
    brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
    contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
    allowUrls: true
    },
    onDemand: true,
    discardSelector: ".discard-answer"
    ,immediatelyShowMarkdownHelp:true
    });


    }
    });














    draft saved

    draft discarded


















    StackExchange.ready(
    function () {
    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53385904%2fi-have-a-for-loop-nested-within-my-while-loop-what-is-causing-an-infinite-loop%23new-answer', 'question_page');
    }
    );

    Post as a guest















    Required, but never shown

























    1 Answer
    1






    active

    oldest

    votes








    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    0














    Why have you used (monthly_salary*portion_saved/10000 ? Since you need to add the portion_saved to the current_savings each month, i would recommend you to use



    current_savings+=(current_savings*r/12) + portion_saved



    I think you can also simplify the process by finding the % to be saved using the below formula



    monthly_salary*(save_percent/100)* 36 = down_payment-epsilon






    share|improve this answer




























      0














      Why have you used (monthly_salary*portion_saved/10000 ? Since you need to add the portion_saved to the current_savings each month, i would recommend you to use



      current_savings+=(current_savings*r/12) + portion_saved



      I think you can also simplify the process by finding the % to be saved using the below formula



      monthly_salary*(save_percent/100)* 36 = down_payment-epsilon






      share|improve this answer


























        0












        0








        0







        Why have you used (monthly_salary*portion_saved/10000 ? Since you need to add the portion_saved to the current_savings each month, i would recommend you to use



        current_savings+=(current_savings*r/12) + portion_saved



        I think you can also simplify the process by finding the % to be saved using the below formula



        monthly_salary*(save_percent/100)* 36 = down_payment-epsilon






        share|improve this answer













        Why have you used (monthly_salary*portion_saved/10000 ? Since you need to add the portion_saved to the current_savings each month, i would recommend you to use



        current_savings+=(current_savings*r/12) + portion_saved



        I think you can also simplify the process by finding the % to be saved using the below formula



        monthly_salary*(save_percent/100)* 36 = down_payment-epsilon







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 20 '18 at 10:46









        Gautham MGautham M

        22619




        22619






























            draft saved

            draft discarded




















































            Thanks for contributing an answer to Stack Overflow!


            • Please be sure to answer the question. Provide details and share your research!

            But avoid …



            • Asking for help, clarification, or responding to other answers.

            • Making statements based on opinion; back them up with references or personal experience.


            To learn more, see our tips on writing great answers.




            draft saved


            draft discarded














            StackExchange.ready(
            function () {
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53385904%2fi-have-a-for-loop-nested-within-my-while-loop-what-is-causing-an-infinite-loop%23new-answer', 'question_page');
            }
            );

            Post as a guest















            Required, but never shown





















































            Required, but never shown














            Required, but never shown












            Required, but never shown







            Required, but never shown

































            Required, but never shown














            Required, but never shown












            Required, but never shown







            Required, but never shown







            Popular posts from this blog

            Can a sorcerer learn a 5th-level spell early by creating spell slots using the Font of Magic feature?

            Image
            28 6 $begingroup$ Per the Font of Magic feature, sorcerer can use Flexible Casting to create 5th-level spell slots at level 7, even though they are not typically available until level 9. You can transform unexpended sorcery points into one spell slot as a bonus action on your turn. The Creating Spell Slots table shows the cost of creating a spell slot of [5th level is 7] If such a sorcerer levels up while still having this 5th-level spell slot, can they choose a 5th-level spell as the spell they gain upon levelling up? The Spellcasting feature states: Additionally, when you gain a level in this class, you can choose one of the sorcerer spells you know and replace it with another spell from the sorcerer spell list, which also must be of a level for which you have spell slots.
            Read more

            Does disintegrating a polymorphed enemy still kill it after the 2018 errata?

            Image
            up vote 13 down vote favorite 1 After the 2018 errata, the disintegrate spell description now reads: A creature targeted by this spell must make a Dexterity saving throw. On a failed save, the target takes 10d6 + 40 force damage. The target is disintegrated if this damage leaves it with 0 hit points. If you were to polymorph an enemy into a rat and then disintegrate it, would the enemy be disintegrated or would it just return to its original form? I know that for Druids, it’s not an instant kill anymore, but is this the case for polymorph as well? dnd-5e spells polymorph errata share | improve this question edited 18 hours ago
            Read more

            A Topological Invariant for $pi_3(U(n))$

            Image
            3 3 $begingroup$ Recently, I saw a construction of topological invariant for $pi_3(U(n))$ with $ngeq 2$ : $$ N=frac{1}{24pi^2}int_{S^3} d^3x epsilon^{ijk} Tr[(U^{-1}partial_{x_i}U)(U^{-1}partial_{x_j}U)(U^{-1}partial_{x_k}U)] , $$ where $Uin U(n)$ depends on $boldsymbol{x}=(x_1,x_2,x_3)in S^3$ , $epsilon^{ijk}$ is the Levi-Civita symbol, $i,j,k=1,2,3$ , and the duplicated indexes are summed over. It is claimed that $N$ is an integer, but why? Update 02/02/2019 I think I got an argument for $n=2$ . In this case, $U=e^{i varphi} q$ with $qin SU(2)$ . Due to the trace and the Levi-Civita symbol in $N$ , $varphi$ does not contribute to $N$ . As $Tr[q^{dagger}partial_i q]=0$ and $(q^{dagger}partial_i q)^{dagger}=-q^{dagger}partial_i q$ , $q^{dagger}partial_i q$ in geneeral has the form $q^{dagger}partia
            Read more