What is sufficient evidence to revoke a defendant's probation?

violation is sufficient evidence to revoke his probation]; 2933.1, subd. (a) [defendant entitled to only 15 percent worktime credit when convicted of a violent felony], 667.5, subd. (c)(9) [robbery is a violent felony]; Cal. Rules of Court, rule 4.421(b)(3) [defendant's service of a prior prison term is a factor in aggravation relevant to the court's consideration of which term of incarceration to impose]; People v. Scott (1994) 9 Cal.4th 331, 352-353 [defendant forfeits contention that imposition of upper term sentence was error by failing to object below]).

The judgment is affirmed.