# Float64 and binary variables in constraints
**URL:** https://discourse.julialang.org/t/float64-and-binary-variables-in-constraints/11961
**Category:** Optimization (Mathematical)
**Created:** [June 26, 2018, 11:45am UTC](https://discourse.julialang.org/t/float64-and-binary-variables-in-constraints/11961 "2018-06-26T11:45:34Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@mm0063](https://discourse.julialang.org/u/mm0063)
#### Post date: [June 26, 2018, 11:45am UTC](https://discourse.julialang.org/t/float64-and-binary-variables-in-constraints/11961/1 "2018-06-26T11:45:34Z")
Hi all,
My problem formulation consists of float64 parameters and variables and binary variables:
using JuMP
using Mosek
M = 1000.0;
@variable(m, y\_connect2[t in ts, cg in cgs, lt in lts], Bin)
@variable(m, x\_connect22[t in ts, cg in cgs, lt in lts] \>= 0.0)
These parameters and variables are used in following constraint:
@constraint(m, aux\_connect5[t in ts, cg in cgs, lt in lts], 0.0 \<= x\_connect22[t,cg,lt] \<= M\*y\_connect2[t,cg,lt] )
Which results in following error
In @constraint(m,aux\_connect5[t in ts, cg in cgs, lt in lts],0.0 \<= x\_connect22[t, cg, lt] \<= (Expr(:escape, :M)) \* (Expr(:escape, :(y\_connect2[t, cg, lt])))): Expected M \* y\_conne
ct2[t, cg, lt] to be a Float64.
Does anyone have an idea about how this error can be solved?
Thanks in advance!
Best regards
---
### Author:  [@abelsiqueira](https://discourse.julialang.org/u/abelsiqueira)
#### Post date: [June 26, 2018, 11:55am UTC](https://discourse.julialang.org/t/float64-and-binary-variables-in-constraints/11961/2 "2018-06-26T11:55:44Z")
Try removing 0.0 \<= from the constraint.
---
### Author:  [@mm0063](https://discourse.julialang.org/u/mm0063)
#### Post date: [June 27, 2018, 8:20am UTC](https://discourse.julialang.org/t/float64-and-binary-variables-in-constraints/11961/3 "2018-06-27T08:20:46Z")
Thank you very much!