diff --git a/README.md b/README.md
index 5987f8b..e053966 100644
--- a/README.md
+++ b/README.md
@@ -10,8 +10,9 @@ Data source from : https://github.com/pomber/covid19
 
 ## Features : 
 
+- Maths functions : Exp, pow, Logistic
 - sync X axis at a value
-- reset (broken, need reload page too)
+- reset 
 - set a limit for y axis
 - select first and last day
 - select data source (confirmed, deaths, recovered)
diff --git a/brain.md b/brain.md
index 5f00766..51f8173 100644
--- a/brain.md
+++ b/brain.md
@@ -3,14 +3,7 @@
 
 ## First production : 
 
-OK  load data source
-OK git clean
-vuejs prod
-hosting
-
-
-Save user config to local
-reset mode 
+User Local Presets (N)
 
 Charts modes:
 - Country day decal
diff --git a/doc.md b/doc.md
index 51cd3b1..f7122a5 100644
--- a/doc.md
+++ b/doc.md
@@ -3,6 +3,8 @@
 
 # Changelog 
 
+v0.04 Fix reset
+v0.03 maths functions
 v0.02 sync x axis
 v0.01 repack, data auto loading
 
diff --git a/src/App.vue b/src/App.vue
index 446abcb..ec9b7d7 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -106,9 +106,26 @@
             ymax: 0,
             syncSince: 0,
             resetConfig: false,
+            math: {
+                exp: {
+                    display: false,
+                    factor: 6.5,
+                    dayPrev: 26
+                },
+                pow: {
+                    display: false,
+                    factor: 3,
+                    dayPrev: 5
+                },
+                logi: {
+                    display: false,
+                    factor:0.15,
+                    dayPrev: 42
+                },
+            },
         },
         countriesConfig: {
-            selected: [{name: "France"}, {name: "Italy"}],
+            selected: [{name: "France"}, {name: "Italy"},{name:"Spain"},{name:"United Kingdom"}],
             basePalette: "tolRainbowColor"
         },
     }
@@ -120,13 +137,13 @@
         props: {
             source: String,
         },
-        data: () => ({
+        data () { return {
             drawer: true,
             title: 'Cov Charts',
             allData: {},
             chartWidth: 500,
-            chartConfig: defaultUserConfig.chartConfig,
-            countriesConfig: defaultUserConfig.countriesConfig,
+            chartConfig: Object.assign({},defaultUserConfig.chartConfig),
+            countriesConfig:Object.assign({}, defaultUserConfig.countriesConfig),
             configLists: {
                 scaleList: ['log', 'linear'],
                 typesList: ['confirmed', 'deaths', 'recovered'],
@@ -137,7 +154,7 @@
                 //all: Object.keys(AllData).sort(),
             },
             debug: false,
-        }),
+        }},
         watch: {
             drawer() {
                 console.log('dd', this.drawer)
@@ -172,26 +189,108 @@
                     uc = JSON.parse(uc)
                     this.countriesConfig = uc.countriesConfig
                     this.chartConfig = uc.chartConfig
-                    this.ccc("loadConfig storage")
                 } else {
-                    this.countriesConfig = defaultUserConfig.countriesConfig
-                    this.chartConfig = defaultUserConfig.chartConfig
-                    this.ccc("loadConfig default")
+                    this.countriesConfig = Object.assign({},defaultUserConfig.countriesConfig)
+                    this.chartConfig = Object.assign({},defaultUserConfig.chartConfig)
                 }
             },
             saveConfig() {
-                this.ccc("saveConfig")
                 let userConfig = {countriesConfig: this.countriesConfig, chartConfig: this.chartConfig}
                 localStorage.setItem('userConfig', JSON.stringify(userConfig))
             },
             resetConfig() {
                 localStorage.setItem('userConfig', 'null')
-                this.ccc("resetConfig")
                 this.loadConfig()
             },
             ccc(a, b) {
-                if (this.debug) console.log(a, b)
+                if (this.debug) console.log(a, b?b:'')
             },
+
+            addMathFunctions(cdata, ymax) {
+                let cc = this.chartConfig.math
+                // Pow
+                if (cc.pow.display) {
+                    cdata.push(this.calcFunction(cdata,
+                        'pow3',
+                        '#ffc500',
+                        i => limit(Math.pow(i - parseInt(cc.pow.dayPrev), parseFloat(cc.pow.factor)), 1, ymax)
+                    ))
+                }
+
+                // Exp
+                if (cc.exp.display) {
+                    cdata.push(this.calcFunction(cdata,
+                        'exp',
+                        '#fd1e00',
+                        i => limit(Math.exp((i + parseInt(cc.exp.dayPrev)) / parseFloat(cc.exp.factor)), 1, ymax)
+                    ))
+                }
+
+
+                if (cc.logi.display) {
+                    // Logistic function
+                    let L = ymax
+                    let k = parseFloat(cc.logi.factor)
+                    let xo = parseInt(cc.logi.dayPrev)
+                    cdata.push(this.calcFunction(cdata,
+                        'logistic',
+                        'rgb(253,130,0)',
+                        //i => limit(L / (1 + Math.exp(Math.E, -k*(i - xo))), 1, 60000)
+                        i => limit(L / (1 + Math.exp(-k * (i - xo))), 0, ymax)
+                    ))
+                }
+
+                return cdata
+
+            },
+            calcFunction(cdata, name, color, callback) {
+                return {
+                    country: name,
+                    color: color,
+                    isMaths: true,
+                    list: cdata[0].list.map((day, id) => {
+                        return {
+                            confirmed: callback(id),
+                            date: day.date
+                        }
+                    })
+                }
+
+            },
+            calculateLog(cdata, ymax) {
+
+                console.log(' calculateLog',)
+                let max = ymax
+                let dayDecal = 2
+
+                let pointsCount = cdata[0].list.length
+                let e = Math.log(max)
+                let step = e / pointsCount
+
+                step , dayDecal;
+                let getY = i => {
+                    i = i === 0 ? 0.5 : i
+                    let value = Math.exp((i + dayDecal) * step)
+                    //let value = Math.pow((i), 3)
+
+                    return value < max ? value : undefined
+                }
+                let pointList = cdata[0].list.map((d, i) => {
+                    return {
+                        confirmed: getY(i),
+                        date: d.date
+                    }
+                })
+                let log = {
+                    country: "log",
+                    color: '#FFCC00',
+                    list: pointList
+                }
+                cdata.push(log)
+
+                return cdata
+            },
+
         },
         computed: {
             syncSinceInt() {
@@ -205,6 +304,7 @@
 
                 let formatedData = []
                 const addSomeDays = false
+                let ymax = 0
 
                 this.countriesConfig.selected.map((country) => {
 
@@ -246,14 +346,19 @@
                         }
                     }
 
-                    // // Get ymax
-                    // filtered.map(d => {
-                    //     ymax = d[this.dataSelected] > ymax ? d[this.dataSelected] : ymax
-                    // })
+                    // Get ymax
+
+                    filtered.map(d => {
+                        ymax = d[this.chartConfig.typeSelected] > ymax ? d[this.chartConfig.typeSelected] : ymax
+                    })
 
                     country.list = filtered
                     formatedData.push(country)
                 })
+
+
+                formatedData = this.addMathFunctions(formatedData, ymax)
+
                 return formatedData
             }
         }
@@ -267,9 +372,23 @@
         font-size: 12px;
     }
 
-    input, select, .v-input {
-        font-size: 12px;
+    input, select, .v-input, .v-label {
+        font-size: 13px;
     }
 
+    .v-list--dense .v-list-item {
+        min-height: 20px;
+    }
+
+    .v-list--dense .v-list-item .v-list-item__content {
+        padding: 2px 0;
+    }
+
+    .v-list-item__action{
+        margin: 8px 0;
+    }
+    .v-text-field.v-text-field--solo .v-input__control {
+        min-height: 20px;
+    }
 
 </style>
diff --git a/src/components/ChartConfig.vue b/src/components/ChartConfig.vue
index 45922e3..ba8f534 100644
--- a/src/components/ChartConfig.vue
+++ b/src/components/ChartConfig.vue
@@ -1,7 +1,7 @@
 <template>
     <div>
 
-        <v-list dense >
+        <v-list dense>
 
             <v-list-item>
                 <v-list-item-action>Scale</v-list-item-action>
@@ -17,7 +17,6 @@
             </v-list-item>
 
 
-
             <v-list-item>
                 <v-list-item-action>Type</v-list-item-action>
                 <v-list-item-content>
@@ -57,7 +56,7 @@
             </v-list-item>
 
             <v-list-item>
-                <v-list-item-action>Sync X </v-list-item-action>
+                <v-list-item-action>Sync X</v-list-item-action>
                 <v-list-item-content>
                     <v-text-field
                             class="numField"
@@ -73,7 +72,7 @@
 
 
             <v-list-item>
-                <v-list-item-action>Limit Y </v-list-item-action>
+                <v-list-item-action>Limit Y</v-list-item-action>
                 <v-list-item-content>
                     <v-text-field
                             class="numField"
@@ -87,6 +86,105 @@
             </v-list-item>
 
 
+            <v-list-item>
+                <v-list-item-action>
+                  <b>Maths Functions</b>
+                </v-list-item-action>
+            </v-list-item>
+
+            <v-list-item>
+
+                <v-list-item-action>
+                    <v-switch
+                            label=" Exp"
+                            v-model="configs.math.exp.display"
+                            color="blue-grey darken-1"
+                    ></v-switch>
+                </v-list-item-action>
+
+                <v-list-item-content v-if="configs.math.exp.display">
+                    F:
+                    <v-text-field
+                            class="numFieldsm"
+                            v-model="configs.math.exp.factor"
+                            label="Factor"
+                            solo
+                            hide-details
+                            single-line
+                    />
+                    D:
+                    <v-text-field
+                            class="numFieldsm"
+                            v-model="configs.math.exp.dayPrev"
+                            label="Days"
+                            solo
+                            hide-details
+                            single-line
+                    />
+                </v-list-item-content>
+            </v-list-item>
+
+            <v-list-item>
+
+                <v-list-item-action>
+                    <v-switch
+                            label=" Pow"
+                            v-model="configs.math.pow.display"
+                            color="blue-grey darken-1"
+                    ></v-switch>
+                </v-list-item-action>
+
+                <v-list-item-content v-if="configs.math.pow.display">
+                    F:
+                    <v-text-field
+                            class="numFieldsm"
+                            v-model="configs.math.pow.factor"
+                            solo
+                            hide-details
+                            single-line
+                    />
+                    D:
+                    <v-text-field
+                            class="numFieldsm"
+                            v-model="configs.math.pow.dayPrev"
+                            solo
+                            hide-details
+                            single-line
+                    />
+                </v-list-item-content>
+            </v-list-item>
+
+
+            <v-list-item>
+
+                <v-list-item-action>
+                    <v-switch
+                            label=" Logi"
+                            v-model="configs.math.logi.display"
+                            color="blue-grey darken-1"
+                    ></v-switch>
+                </v-list-item-action>
+
+                <v-list-item-content v-if="configs.math.logi.display">
+                    F:
+                    <v-text-field
+                            class="numFieldsm"
+                            v-model="configs.math.logi.factor"
+                            solo
+                            hide-details
+                            single-line
+                    />
+                    D:
+                    <v-text-field
+                            class="numFieldsm"
+                            v-model="configs.math.logi.dayPrev"
+                            solo
+                            hide-details
+                            single-line
+                    />
+                </v-list-item-content>
+            </v-list-item>
+
             <v-list-item>
                 <v-list-item-action></v-list-item-action>
                 <v-list-item-content>
@@ -96,6 +194,8 @@
                     </v-btn>
                 </v-list-item-content>
             </v-list-item>
+
+
         </v-list>
     </div>
 </template>
@@ -109,12 +209,11 @@
         props: ['configs', 'configLists'],
         components: {Counter},
         data() {
-            return {
-            }
+            return {}
         },
-        watch:{
-            'configs.syncSince': function(value){
-                if ( ! (value > 0 ) ){
+        watch: {
+            'configs.syncSince': function (value) {
+                if (!(value > 0)) {
                     this.configs.syncSince = 0
                 }
             }
@@ -124,7 +223,7 @@
                 this.configs.resetConfig = true
             }
         },
-        computed: { }
+        computed: {}
     }
 </script>
 
@@ -139,4 +238,9 @@
         max-width: 50%;
     }
 
+    .numFieldsm {
+        max-width: 50px;
+    }
+
+
 </style>
\ No newline at end of file
diff --git a/src/components/MultiBarChartSingle.vue b/src/components/MultiBarChartSingle.vue
index 5c29cc9..8998803 100644
--- a/src/components/MultiBarChartSingle.vue
+++ b/src/components/MultiBarChartSingle.vue
@@ -18,7 +18,7 @@
             </div>
 
             <div v-for="(cinfo,id) in countriesData" :key="'ns'+id">
-                <div class="chartBlock">
+                <div class="chartBlock"  v-if="!cinfo.isMaths">
                     <BarChartSingle
                             :dataType="dtype"
                             :country="cinfo.name"
diff --git a/src/components/html/Counter.vue b/src/components/html/Counter.vue
index c73830d..1ab18ee 100644
--- a/src/components/html/Counter.vue
+++ b/src/components/html/Counter.vue
@@ -1,7 +1,7 @@
 <template>
     <div :class="'counter '+ classname">
         <button @click="click(-1)" class="bleft">-</button>
-        <span>{{value}}</span>
+        <span>{{input}}</span>
         <button @click="click(1)" class="bright">+</button>
     </div>
 </template>
@@ -17,18 +17,16 @@
             classname: {type: String, default: 'themeGreen'},
         },
         data() {
-            return {
-                value: this.input,
-            }
+            return {}
         },
         methods: {
             click(dirfactor) {
-                this.value = this.value + (dirfactor * this.inc)
-                if (this.value > this.max) this.value = this.max
-                if (this.value < this.min) this.value = this.min
-                this.$emit('input', this.value)
+                let input = this.input + (dirfactor * this.inc)
+                if (input > this.max) input = this.max
+                if (input < this.min) input = this.min
+                this.$emit('input', input)
             }
-        }
+        },
     }
 </script>
 
@@ -44,16 +42,18 @@
         padding: 0;
         width: 15px;
         line-height: 15px;
-    /*/margin: 0 px 3 px 0 px 3 px;*/
+        /*/margin: 0 px 3 px 0 px 3 px;*/
     }
 
     .bleft, .bright {
         border: 0px solid red;
         border-radius: 5px;
     }
+
     .bleft {
         margin-right: 3px;
     }
+
     .bright {
         margin-left: 3px;
     }
@@ -61,14 +61,17 @@
     .themeGreen.counter {
         border: 1px solid #2c3e50;
         background: #d3e3e0;
-        color:white;
+        color: white;
     }
+
     .themeGreen.counter button {
         background: #d3e3e0;
     }
+
     .themeGreen .bleft {
         border-right: 1px solid #2c3e50;
     }
+
     .themeGreen .bright {
         border-left: 1px solid #2c3e50;
     }
@@ -76,16 +79,19 @@
     .themeGrey.counter {
         border: 0px solid #8ecaf9;
         background: inherit;
-        color:white;
+        color: white;
     }
+
     .themeGrey.counter button {
         background: #767676;
         width: 18px;
         line-height: 18px;
     }
+
     .themeGrey .bleft {
         border-right: 0px solid #8ecaf9;
     }
+
     .themeGrey .bright {
         border-left: 0px solid #8ecaf9;
     }