[R] argument to 'which' is not logical

[Allan Tanaka]

I'm trying to run the code: inds<-which(c != 0 ), but it gave me error: Error in base::which(x, arr.ind, useNames, ...) :   argument to 'which' is not logical
Here is code:
alphas <- seq(0, 1, by=.002)mses <- numeric(501)mins <- numeric(501)maxes <- numeric(501)for(i in 1:501){  cvfits <- cv.glmnet(Train2, Train$Item_Outlet_Sales, alpha=alphas[i], nfolds=32)  loc <- which(cvfits$lambda==cvfits$lambda.min)  maxes[i] <- cvfits$lambda %>% max  mins[i] <- cvfits$lambda %>% min  mses[i] <- cvfits$cvm[loc]}`%ni%`<-Negate(`%in%`)c<-coef(cvfits,s='lambda.1se',exact=TRUE)inds<-which(c != 0 )
Here is the c content looks like: > c33 x 1 sparse Matrix of class "dgCMatrix"                                           1(Intercept)                      7.476895931Item_Fat_Content.Low.Fat         .          Item_Fat_Content.Regular         .          Item_Type.Breads                 .          Item_Type.Breakfast              .          Item_Type.Canned                 0.003430669Item_Type.Dairy                 -0.022579673Item_Type.Frozen.Foods          -0.008216547Item_Type.Fruits.and.Vegetables  .          Item_Type.Hard.Drinks            .          Item_Type.Health.and.Hygiene     .          Item_Type.Household              .          Item_Type.Meat                   .          Item_Type.Others                 .          Item_Type.Seafood                .          Item_Type.Snack.Foods            .          Item_Type.Soft.Drinks            .          Item_Type.Starchy.Foods          .          Outlet_Establishment_Year.1987  -0.345927916Outlet_Establishment_Year.1997   1.692678186Outlet_Establishment_Year.1998  -2.259508290Outlet_Establishment_Year.1999   .          Outlet_Establishment_Year.2002  -0.032971913Outlet_Establishment_Year.2004   1.756230495Outlet_Establishment_Year.2007   .          Outlet_Establishment_Year.2009  -0.549210057Outlet_Size.Medium               0.056897825Outlet_Size.Small               -1.706006538Outlet_Location_Type.Tier.3      0.373456218Item_Identifier_CombinedFD       .          Item_MRP                         0.505435352Item_Weight                      .          Item_Visibility_MeanRatio       -0.007274202
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