# Error using odearguments (line 113) Inputs must be floats, namely single or double.

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Quanshun An on 14 Apr 2021
Answered: Walter Roberson on 14 Apr 2021
clear;clc;close all;
syms t
k1 = 2196595622168743217/1130684981446705152 - (27270095640660425*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(6030319901049094144*(99*exp(-(3*t)/40) + 1)) - (3272411476879251*(5/(359*exp(-(2*t)/25) + 1) - 1))/(376894993815568384*(359*exp(-(2*t)/25) + 1)) - (53449387455694433*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(2826712453616762880*(99999*exp(-(7*t)/50) + 1)) - (1090803825626417*(5/(39*exp(-(2*t)/25) + 1) - 1))/(1130684981446705152*(39*exp(-(2*t)/25) + 1))
k2 = -((204350833091936256*exp(-(3*t)/40))/14621315237439125 + 6192449487634432/43863945712317375)*((2*(5/(39*exp(-(2*t)/25) + 1) - 1))/(39*exp(-(2*t)/25) + 1) + (75*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(8*(99*exp(-(3*t)/40) + 1)) + (18*(5/(359*exp(-(2*t)/25) + 1) - 1))/(359*exp(-(2*t)/25) + 1) + (196*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(5*(99999*exp(-(7*t)/50) + 1))), (135*exp(-(3*t)/40)*((1089*exp(-(3*t)/40))/25 + 11/25))/(8*(99*exp(-(3*t)/40) + 1)^2) - ((204350833091936256*exp(-(3*t)/40))/14621315237439125 + 6192449487634432/43863945712317375)*((2*(5/(39*exp(-(2*t)/25) + 1) - 1))/(39*exp(-(2*t)/25) + 1) + (75*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(8*(99*exp(-(3*t)/40) + 1)) + (18*(5/(359*exp(-(2*t)/25) + 1) - 1))/(359*exp(-(2*t)/25) + 1) + (196*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(5*(99999*exp(-(7*t)/50) + 1)))
k3 = (4573562550968941875*((808396133113004032*exp(-(2*t)/25))/28660319845255881 + 2251799813685248/28660319845255881))/(36893488147419103232*(359*exp(-(2*t)/25) + 1)) - ((808396133113004032*exp(-(2*t)/25))/28660319845255881 + 2251799813685248/28660319845255881)*((2*(5/(39*exp(-(2*t)/25) + 1) - 1))/(39*exp(-(2*t)/25) + 1) + (75*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(8*(99*exp(-(3*t)/40) + 1)) + (18*(5/(359*exp(-(2*t)/25) + 1) - 1))/(359*exp(-(2*t)/25) + 1) + (196*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(5*(99999*exp(-(7*t)/50) + 1))), (4573562550968941875*((808396133113004032*exp(-(2*t)/25))/28660319845255881 + 2251799813685248/28660319845255881))/(36893488147419103232*(359*exp(-(2*t)/25) + 1)) - ((808396133113004032*exp(-(2*t)/25))/28660319845255881 + 2251799813685248/28660319845255881)*((2*(5/(39*exp(-(2*t)/25) + 1) - 1))/(39*exp(-(2*t)/25) + 1) + (75*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(8*(99*exp(-(3*t)/40) + 1)) + (18*(5/(359*exp(-(2*t)/25) + 1) - 1))/(359*exp(-(2*t)/25) + 1) + (196*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(5*(99999*exp(-(7*t)/50) + 1))) + (3231*exp(-(2*t)/25)*((1436*exp(-(2*t)/25))/9 + 4/9))/(50*(359*exp(-(2*t)/25) + 1)^2)
k4a = -(1500*((87820192733724672*exp(-(2*t)/25))/3184479982806209 + 2251799813685248/3184479982806209))/(((9007199254740992*2^(1/2)*13139^(1/2)*(3/(2*(39*exp(-(2*t)/25) + 1)) + 28/(25*(99999*exp(-(7*t)/50) + 1)))*(39*exp(-(2*t)/25) + 1))/(326392588619071785*((14987979559889010688*exp(-(2*t)/25))/4984107436090777 + 1152921504606846976/14952322308272331)*((2*(5/(39*exp(-(2*t)/25) + 1) - 1))/(39*exp(-(2*t)/25) + 1) + (75*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(8*(99*exp(-(3*t)/40) + 1)) + (18*(5/(359*exp(-(2*t)/25) + 1) - 1))/(359*exp(-(2*t)/25) + 1) + (196*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(5*(99999*exp(-(7*t)/50) + 1)))) - 825167718535963/140737488355328)*(39*exp(-(2*t)/25) + 1)), (39*exp(-(2*t)/25)*(156*exp(-(2*t)/25) + 4))/(50*(39*exp(-(2*t)/25) + 1)^2) - (1500*((87820192733724672*exp(-(2*t)/25))/3184479982806209 + 2251799813685248/3184479982806209))/(((9007199254740992*2^(1/2)*13139^(1/2)*(3/(2*(39*exp(-(2*t)/25) + 1)) + 28/(25*(99999*exp(-(7*t)/50) + 1)))*(39*exp(-(2*t)/25) + 1))/(326392588619071785*((14987979559889010688*exp(-(2*t)/25))/4984107436090777 + 1152921504606846976/14952322308272331)*((2*(5/(39*exp(-(2*t)/25) + 1) - 1))/(39*exp(-(2*t)/25) + 1) + (75*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(8*(99*exp(-(3*t)/40) + 1)) + (18*(5/(359*exp(-(2*t)/25) + 1) - 1))/(359*exp(-(2*t)/25) + 1) + (196*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(5*(99999*exp(-(7*t)/50) + 1)))) - 825167718535963/140737488355328)*(39*exp(-(2*t)/25) + 1))
k4b = -(1120*((234560134967407411200*exp(-(7*t)/50))/14072776651639139 + 7036874417766400/42218329954917417))/(((9007199254740992*2^(1/2)*13139^(1/2)*(3/(2*(39*exp(-(2*t)/25) + 1)) + 28/(25*(99999*exp(-(7*t)/50) + 1)))*(39*exp(-(2*t)/25) + 1))/(326392588619071785*((14987979559889010688*exp(-(2*t)/25))/4984107436090777 + 1152921504606846976/14952322308272331)*((2*(5/(39*exp(-(2*t)/25) + 1) - 1))/(39*exp(-(2*t)/25) + 1) + (75*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(8*(99*exp(-(3*t)/40) + 1)) + (18*(5/(359*exp(-(2*t)/25) + 1) - 1))/(359*exp(-(2*t)/25) + 1) + (196*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(5*(99999*exp(-(7*t)/50) + 1)))) - 825167718535963/140737488355328)*(99999*exp(-(7*t)/50) + 1)), (9799902*exp(-(7*t)/50)*((2499975*exp(-(7*t)/50))/28 + 25/28))/(625*(99999*exp(-(7*t)/50) + 1)^2) - (1120*((234560134967407411200*exp(-(7*t)/50))/14072776651639139 + 7036874417766400/42218329954917417))/(((9007199254740992*2^(1/2)*13139^(1/2)*(3/(2*(39*exp(-(2*t)/25) + 1)) + 28/(25*(99999*exp(-(7*t)/50) + 1)))*(39*exp(-(2*t)/25) + 1))/(326392588619071785*((14987979559889010688*exp(-(2*t)/25))/4984107436090777 + 1152921504606846976/14952322308272331)*((2*(5/(39*exp(-(2*t)/25) + 1) - 1))/(39*exp(-(2*t)/25) + 1) + (75*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(8*(99*exp(-(3*t)/40) + 1)) + (18*(5/(359*exp(-(2*t)/25) + 1) - 1))/(359*exp(-(2*t)/25) + 1) + (196*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(5*(99999*exp(-(7*t)/50) + 1)))) - 825167718535963/140737488355328)*(99999*exp(-(7*t)/50) + 1))
k12 = -((1089*exp(-(3*t)/40))/25 + 11/25)*((1090803825626417*(5/(39*exp(-(2*t)/25) + 1) - 1))/(1125899906842624*(39*exp(-(2*t)/25) + 1)) + (81810286921981275*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(18014398509481984*(99*exp(-(3*t)/40) + 1)) + (9817234430637753*(5/(359*exp(-(2*t)/25) + 1) - 1))/(1125899906842624*(359*exp(-(2*t)/25) + 1)) + (53449387455694433*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(2814749767106560*(99999*exp(-(7*t)/50) + 1)))
k23 = -((808396133113004032*exp(-(2*t)/25))/15791020456434255 + 2251799813685248/15791020456434255)*((2*(5/(39*exp(-(2*t)/25) + 1) - 1))/(39*exp(-(2*t)/25) + 1) + (75*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(8*(99*exp(-(3*t)/40) + 1)) + (18*(5/(359*exp(-(2*t)/25) + 1) - 1))/(359*exp(-(2*t)/25) + 1) + (196*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(5*(99999*exp(-(7*t)/50) + 1)))
k34a = -(3*((87820192733724672*exp(-(2*t)/25))/3184479982806209 + 2251799813685248/3184479982806209)*((2*(5/(39*exp(-(2*t)/25) + 1) - 1))/(39*exp(-(2*t)/25) + 1) + (75*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(8*(99*exp(-(3*t)/40) + 1)) + (18*(5/(359*exp(-(2*t)/25) + 1) - 1))/(359*exp(-(2*t)/25) + 1) + (196*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(5*(99999*exp(-(7*t)/50) + 1))))/(2*(3/(2*(39*exp(-(2*t)/25) + 1)) + 28/(25*(99999*exp(-(7*t)/50) + 1)))*(39*exp(-(2*t)/25) + 1))
k34b = -((351840202451111116800*exp(-(7*t)/50))/22291359879643463 + 3518437208883200/22291359879643463)*((98*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(125*(99999*exp(-(7*t)/50) + 1)) + (28*((2*(5/(39*exp(-(2*t)/25) + 1) - 1))/(39*exp(-(2*t)/25) + 1) + (75*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(8*(99*exp(-(3*t)/40) + 1)) + (18*(5/(359*exp(-(2*t)/25) + 1) - 1))/(359*exp(-(2*t)/25) + 1) + (196*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(5*(99999*exp(-(7*t)/50) + 1))))/(25*(3/(2*(39*exp(-(2*t)/25) + 1)) + 28/(25*(99999*exp(-(7*t)/50) + 1)))*(99999*exp(-(7*t)/50) + 1)))
b1 = 7.8231e-05
b2 = 0
b3 = (7317700081550307*((25868676259616129024*exp(-(2*t)/25))/65278517723814357 + 72057594037927936/65278517723814357))/(649325391394576216883200*(359*exp(-(2*t)/25) + 1)) + (486*((1436*exp(-(2*t)/25))/9 + 4/9))/(1375*(359*exp(-(2*t)/25) + 1))
b4a = (162*(156*exp(-(2*t)/25) + 4))/(1375*(39*exp(-(2*t)/25) + 1)) - (3*((936748722493063168*exp(-(2*t)/25))/2417722878659791 + 72057594037927936/7253168635979373))/(22000*((9007199254740992*2^(1/2)*13139^(1/2)*(3/(2*(39*exp(-(2*t)/25) + 1)) + 28/(25*(99999*exp(-(7*t)/50) + 1)))*(39*exp(-(2*t)/25) + 1))/(326392588619071785*((14987979559889010688*exp(-(2*t)/25))/4984107436090777 + 1152921504606846976/14952322308272331)*((2*(5/(39*exp(-(2*t)/25) + 1) - 1))/(39*exp(-(2*t)/25) + 1) + (75*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(8*(99*exp(-(3*t)/40) + 1)) + (18*(5/(359*exp(-(2*t)/25) + 1) - 1))/(359*exp(-(2*t)/25) + 1) + (196*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(5*(99999*exp(-(7*t)/50) + 1)))) - 825167718535963/140737488355328)*(39*exp(-(2*t)/25) + 1))
b4b = (3024*((2499975*exp(-(7*t)/50))/28 + 25/28))/(34375*(99999*exp(-(7*t)/50) + 1)) - (7*((13848568854164275200*exp(-(7*t)/50))/62450406459847 + 112589990684262400/50772180451855611))/(68750*((9007199254740992*2^(1/2)*13139^(1/2)*(3/(2*(39*exp(-(2*t)/25) + 1)) + 28/(25*(99999*exp(-(7*t)/50) + 1)))*(39*exp(-(2*t)/25) + 1))/(326392588619071785*((14987979559889010688*exp(-(2*t)/25))/4984107436090777 + 1152921504606846976/14952322308272331)*((2*(5/(39*exp(-(2*t)/25) + 1) - 1))/(39*exp(-(2*t)/25) + 1) + (75*(100/(11*(99*exp(-(3*t)/40) + 1)) - 1))/(8*(99*exp(-(3*t)/40) + 1)) + (18*(5/(359*exp(-(2*t)/25) + 1) - 1))/(359*exp(-(2*t)/25) + 1) + (196*(2/(99999*exp(-(7*t)/50) + 1) - 1))/(5*(99999*exp(-(7*t)/50) + 1)))) - 825167718535963/140737488355328)*(99999*exp(-(7*t)/50) + 1))
C_Soil_initial = 1;
C_Roots_initial = 0;
C_Stem_initial = 0;
C_Leaves_initial = 0;
C_Fruits_initial = 0;
solver = @(t,C)[-k1 * C(1) + b1; -k2 * C(2) + k12 * C(1) + b2; -k3 * C(3) + k23 * C(2) + b3; -k4a * C(4) + k34a * C(3) + b4a; -k4b * C(5) + k34b * C(3) + b4b];
initialconcentrations = [C_Soil_initial C_Roots_initial C_Stem_initial C_Leaves_initial C_Fruits_initial];
tol = 1e-13; % tolerance
options = odeset ('RelTol', tol,'AbsTol',[tol tol tol tol tol], 'NonNegative',1, 'NonNegative',2);
[t,C] = ode15s (solver, [0 5], initialconcentrations,options);
plot(t,C(:,1)); hold on
plot(t,C(:,2)); hold on
plot(t,C(:,3)); hold on
plot(t,C(:,4)); hold on
plot(t,C(:,5)); hold on
legend('Soil','Roots','Stem','Leaves','Fruits')

William Rose on 14 Apr 2021
I recommend that you remove the syms command at the top of your code.
You have defined a bunch of constants in terms of t, and t is symbolic. I think you need to define constants as actual constants and then use those constants, and the variable t (which should not be symbolic), inside function solver, which you have defined and which is calculating the derivatives.

Walter Roberson on 14 Apr 2021
You need to use matlabFunction() to turn your symbolic expressions into numeric code. Be sure to use the 'vars' option to control the order of the input variables.