This expression is too large.
显示 更早的评论
The following error message occurred while using the .m file in simulink. I was going to simulate a 7x7 manipulator with simulink.
get_MassMatrix65
This expression is too large. Store partial results in temporary variables to split the expression into smaller parts.
Is there any other way to break an expression into variables?
回答（1 个）
Steven Lord
2023-6-18
0 个投票
If you're generating the code for your block from a symbolic expression using matlabFunction or matlabFunctionBlock, as I suspect is the case, have you disabled optimization by specifying the name-value argument Optimize=false? If so try to re-enable optimization by omitting that name-value argument entirely (to use the default of Optimize=true.)
5 个评论
Walter Roberson
2023-6-18
Caution:
In several releases, optimize true malfunctioned, sometimes greatly. I have not tested in the two most recent releases.
진웅 이
2023-6-19
That does not seem to cause problems when I test ?
t3206 = str2sym('t2855+t2856+t2857+t2858+t2859+t2860+t2861+t2862+t2863+t2864+t2865+t2866+t2867+t2868+t2869+t2870+t2871+t2872+t2873+t2874+t2875+t2876+t2877+t2878+t2879+t2880+t2881+t2882+t2883+t2884+t2885+t2886+t2887+t2888+t2889+t2890+t2891+t2892+t2893+t2894+t2895+t2896+t2897+t2898+t2899+t2900+t2901+t2902+t2903+t2904+t2905+t2906+t2907+t2908+t2909+t2910+t2911+t2912+t2913+t2914+t2915+t2916+t2917+t2918+t2919+t2920+t2921+t2922+t2923+t2924+t2925+t2926+t2927+t2928+t2929+t2930+t2931+t2932+t2933+t2934+t2935+t2936+t2937+t2938+t2939+t2940+t2941+t2942+t2943+t2944+t2945+t2946+t2947+t2948+t2949+t2950+t2951+t2952+t2953+t2954+t2955+t2956+t2957+t2958+t2959+t2960+t2961+t2962+t2963+t2964+t2965+t2966+t2967+t2968+t2969+t2970+t2971+t2972+t2973+t2974+t2975+t2976+t2977+t2978+t2979+t2980+t2981+t2982+t2983+t2984+t2985+t2986+t2987+t2988+t2989+t2990+t2991+t2992+t2993+t2994+t2995+t2996+t2997+t2998+t2999+t3000+t3001+t3002+t3003+t3004+t3005+t3006+t3007+t3008+t3009+t3010+t3011+t3012+t3013+t3014+t3015+t3016+t3017+t3018+t3019+t3020+t3021+t3022+t3023+t3024+t3025+t3026+t3027+t3028+t3029+t3030+t3031+t3032+t3033+t3034+t3035+t3036+t3037+t3038+t3039+t3040+t3041+t3042+t3043+t3044+t3045+t3046+t3047+t3048+t3049+t3050+t3051+t3052+t3053+t3054+t3055+t3056+t3057+t3058+t3059+t3060+t3061+t3062+t3063+t3064+t3065+t3066+t3067+t3068+t3069+t3070+t3071+t3072+t3073+t3074+t3075+t3076+t3077+t3078+t3079+t3080+t3081+t3082+t3083+t3084+t3085+t3086+t3087+t3088+t3089+t3090+t3091+t3092+t3093+t3094+t3095+t3096+t3097+t3098+t3099+t3100+t3101+t3102+t3103+t3104+t3105+t3106+t3107+t3108+t3109+t3110+t3111+t3112+t3113+t3114+t3115+t3116+t3117+t3118+t3119+t3120+t3121+t3122+t3123+t3124+t3125+t3126+t3127+t3128+t3129+t3130+t3131+t3132+t3133+t3134+t3135+t3136+t3137+t3138+t3139+t3140+t3141+t3142+t3143+t3144+t3145+t3146+t3147+t3148+t3149+t3150+t3151+t3152+t3153+t3154+t3155+t3156+t3157+t3158+t3159+t3160+t3161+t3162+t3163+t3164+t3165+t3166+t3167+t3168+t3169+t3170+t3171+t3172+t3173+t3174+t3175+t3176+t3177+t3178+t3179+t3180+t3181+t3182+t3183+t3184+t3185+t3186+t3187+t3188+t3189+t3190+t3191+t3192+t3193+t3194+t3195+t3196+t3197+t3198+t3199+t3200+t3201+t3202+t3203+t3204+t3205-t11532-t11534-t11537-t11538-t11540-t11546-t11551-t11554-t11555-t11559-t11560-t11561-t11563-t11567-t11568-t11569-t11573-t11574-t11578-t11580-t11581-t11583-t11584-t11592-t11595-t11601-t11602-t11610-t11618-t11621-t11622-t11628-t11632-t11633-t11634-t11639-t11656-t11662-t11665-t11667-t11668-t11669-t11670-t11671-t11672-t11681-t11684-t11686-t11690-t11697-t11698-t11706-t11707-t11713-t11715-t11717-t11718-t11721-t11727-t11729-t11737-t11738-t11741-t11744-t11745-t11761-t11762-t11763-t11764-t11767-t11768-t11781-t11782-t11783-t11784-t11785-t11786-t11790-t11792-t11794-t11797-t11798-t11799-t11804-t11805-t11806-t11807-t11812-t11817-t11821-t3.*t4.*t7.*t13.*3.731166785767855e-3-t3.*t4.*t5.*t10.*t14.*1.185446863937387e-3-t3.*t4.*t8.*t9.*t14.*5.367504695157484e-3-t3.*t4.*t7.*t8.*t9.*t10.*1.272243011263065e-3-t2.*t3.*t4.*t7.*t13.*t17.*3.55634059181216e-3-t3.*t4.*t5.*t7.*t13.*t15.*1.758741834919224e-3')
matlabFunction(t3206, 'file', 't3206.m', 'optimize', false)
Laribi Nessrine
2023-11-3
I have the same problem could you tell me please where i can find "optimization setting" in simulink. Thanks
Walter Roberson
2023-11-3
There is no relevant optimization setting in Simulink. The long expression with t2855 and so on is output from having used matlabFunction on a symbolic expression and having asked it to write to a file. I showed above how to turn off optimization when you do that:
matlabFunction(t3206, 'file', 't3206.m', 'optimize', false)
类别
在 帮助中心 和 File Exchange 中查找有关 Manual Performance Optimization 的更多信息
2023-11-3
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
